返回得分详情

在此页面上

语法

选项
输出
影响分数的因素
示例
操作符示例
自定义分数示例

您可以在 $search 阶段中使用 scoreDetails 布尔选项，详细了解查询结果中每个文档的得分明细。要查看元数据，必须在 $project 阶段中使用 $meta 表达式。

语法

{
  "$search": {
    "<operator>": {
      <operator-specification>
    },
    "scoreDetails": true | false
  }
},
{
  "$project": {
    "scoreDetails": {"$meta": "searchScoreDetails"}
  }
}

选项

在 $search 阶段， scoreDetails布尔选项采用以下值之一：

true - 在结果中包含文档得分的详细信息。如果设置为 true，Atlas Search 返回结果中每个文档的得分明细。要了解更多信息，请参阅输出。
false - 排除结果的分数细分详细信息。（默认）

如果省略，则scoreDetails选项默认为false 。

在 $project 阶段，scoreDetails 字段采用 $meta 表达式，该表达式需要以下值：

`searchScoreDetails`	返回结果中每个文档的分数明细。

输出

scoreDetails选项会在结果中每个文档的scoreDetails对象内的details数组中返回以下字段：

字段	类型	说明
`value`	float	评分公式的子集对分数的贡献。顶层 `value` 显示结果文档的全部分数，等于 `$searchScore` 的值。评分公式根据查询中使用的操作符而有所不同。例如，对于包含 text 和 near 操作符的复合查询，Atlas Search `BM25Similarity + distance decay function` 使用以下评分公式：
`description`	字符串	评分公式的子集，包括文件评分方式和计算分数时考虑的因素的详细信息。顶层的 `description` 显示了用于为文档评分的整个评分公式。要学习；了解更多信息，请参阅影响分数的因素。
`details`	对象数组	基于评分公式的子集对文档中每个匹配项的分数进行细分。该值是分数详细信息对象的数组，具有递归结构。

影响分数的因素

对于BM25Similarity ，分数计算为boost * idf * tf 。 Atlas Search 在计算分数时会考虑以下BM25Similarity因素：

boost

提高术语的重要性。

freq

查询词的频率。

idf

查询的反向文档频率。 Atlas Search 使用以下公式计算频率：

log(1 + (N - n + 0.5) / (n + 0.5))

其中：

N 是包含该字段的文档总数。
n 是包含该术语的文档数量。

tf

术语频率。Atlas Search 使用以下公式计算频率：

freq / (freq + k1 * (1 - b + b * dl / avgdl))

其中：

freq 是该词语在文档中出现的次数。
k1 是内部指定的术语饱和度参数。它会影响每次出现该术语时分数增加的程度。
avgdl 是所有文档中字段的平均长度。
dl 是文档中字段的长度。
b 是长度归一化参数，也是在内部设置的。 b乘以dl与avgdl的比率。如果b增加，则dl与avgdl的比率的影响会放大。

对于距离衰减函数，分数计算为pivot / (pivot + abs(fieldValue - origin)) 。 Atlas Search 在计算分数时会考虑以下因素：

`origin`	要搜索附近的值。这是测量结果接近度的原点。
`fieldValue`	您在文档中查询的字段的值。`fieldValue`越接近`origin` ，邻近查询的分数就越高。
`pivot`	指定为参考点的值，如果`fieldValue`和`origin`之间的距离等于`0.5` ，则分数等于该值。这定义了随着`fieldValue`和`origin`之间的距离增加，分数衰减的速度。对于`fieldValue`和`origin`之间的给定距离，如果`pivot`减小，则分数也会减小。

示例

以下示例展示如何在以下结果中检索分数的详细信息：

查询使用text 、 near 、 compound和embeddedDocument操作符运行。
使用function选项表达式修改分数的查询。

提示

要以递归方式查看对象数组中分数的详细信息，请通过运行以下命令来配置mongosh中的设置：

config.set('inspectDepth', Infinity)

操作符示例

以下示例演示如何使用$search scoreDetails选项检索text 、 near 、复合和embeddedDocument操作符查询结果中的文档的分数明细。

以下示例使用文本操作符查询 sample_mflix.movies 集合中 title 字段的术语 autumn。该查询在 $search 阶段指定 scoreDetails 选项，以检索结果中每个文档得分的明细。该查询使用 $limit 阶段将结果限制为三个文档，并使用 $project 阶段进行以下操作：

排除_id字段。
仅包含title字段。
将score字段添加到结果中以返回文档的分数，并将scoreDetails字段添加到结果中以返回文档分数的明细。

1 db.movies.aggregate([
2   {
3     "$search": {
4       "text": {
5         "path": "title",
6         "query": "autumn"
7       },
8       "scoreDetails": true
9     }
10   },
11   {
12     "$limit": 3
13   },
14   {
15     "$project": {
16       "_id": 0,
17       "title": 1,
18       "score": { "$meta": "searchScore" },
19       "scoreDetails": { "$meta": "searchScoreDetails" }
20     }
21   }
22 ])

1 [
2   {
3     title: 'Autumn Leaves',
4     score: 3.834893226623535,
5     scoreDetails: {
6       value: 3.834893226623535,
7       description: '$type:string/title:autumn [BM25Similarity], result of:',
8       details: [
9         {
10           value: 3.834893226623535,
11           description: 'score(freq=1.0), computed as boost * idf * tf from:',
12           details: [
13             {
14               value: 7.39188289642334,
15               description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
16               details: [
17                 {
18                   value: 14,
19                   description: 'n, number of documents containing term',
20                   details: []
21                 },
22                 {
23                   value: 23529,
24                   description: 'N, total number of documents with field',
25                   details: []
26                 }
27               ]
28             },
29             {
30               value: 0.5187978744506836,
31               description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
32               details: [
33                 {
34                   value: 1,
35                   description: 'freq, occurrences of term within document',
36                   details: []
37                 },
38                 {
39                   value: 1.2000000476837158,
40                   description: 'k1, term saturation parameter',
41                   details: []
42                 },
43                 {
44                   value: 0.75,
45                   description: 'b, length normalization parameter',
46                   details: []
47                 },
48                 {
49                   value: 2,
50                   description: 'dl, length of field',
51                   details: []
52                 },
53                 {
54                   value: 2.868375301361084,
55                   description: 'avgdl, average length of field',
56                   details: []
57                 }
58               ]
59             }
60           ]
61         }
62       ]
63     }
64   },
65   {
66     title: 'Late Autumn',
67     score: 3.834893226623535,
68     scoreDetails: {
69       value: 3.834893226623535,
70       description: '$type:string/title:autumn [BM25Similarity], result of:',
71       details: [
72         {
73           value: 3.834893226623535,
74           description: 'score(freq=1.0), computed as boost * idf * tf from:',
75           details: [
76             {
77               value: 7.39188289642334,
78               description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
79               details: [
80                 {
81                   value: 14,
82                   description: 'n, number of documents containing term',
83                   details: []
84                 },
85                 {
86                   value: 23529,
87                   description: 'N, total number of documents with field',
88                   details: []
89                 }
90               ]
91             },
92             {
93               value: 0.5187978744506836,
94               description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
95               details: [
96                 {
97                   value: 1,
98                   description: 'freq, occurrences of term within document',
99                   details: []
100                 },
101                 {
102                   value: 1.2000000476837158,
103                   description: 'k1, term saturation parameter',
104                   details: []
105                 },
106                 {
107                   value: 0.75,
108                   description: 'b, length normalization parameter',
109                   details: []
110                 },
111                 {
112                   value: 2,
113                   description: 'dl, length of field',
114                   details: []
115                 },
116                 {
117                   value: 2.868375301361084,
118                   description: 'avgdl, average length of field',
119                   details: []
120                 }
121               ]
122             }
123           ]
124         }
125       ]
126     }
127   },
128   {
129     title: 'Cheyenne Autumn',
130     score: 3.834893226623535,
131     scoreDetails: {
132       value: 3.834893226623535,
133       description: '$type:string/title:autumn [BM25Similarity], result of:',
134       details: [
135         {
136           value: 3.834893226623535,
137           description: 'score(freq=1.0), computed as boost * idf * tf from:',
138           details: [
139             {
140               value: 7.39188289642334,
141               description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
142               details: [
143                 {
144                   value: 14,
145                   description: 'n, number of documents containing term',
146                   details: []
147                 },
148                 {
149                   value: 23529,
150                   description: 'N, total number of documents with field',
151                   details: []
152                 }
153               ]
154             },
155             {
156               value: 0.5187978744506836,
157               description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
158               details: [
159                 {
160                   value: 1,
161                   description: 'freq, occurrences of term within document',
162                   details: []
163                 },
164                 {
165                   value: 1.2000000476837158,
166                   description: 'k1, term saturation parameter',
167                   details: []
168                 },
169                 {
170                   value: 0.75,
171                   description: 'b, length normalization parameter',
172                   details: []
173                 },
174                 {
175                   value: 2,
176                   description: 'dl, length of field',
177                   details: []
178                 },
179                 {
180                   value: 2.868375301361084,
181                   description: 'avgdl, average length of field',
182                   details: []
183                 }
184               ]
185             }
186           ]
187         }
188       ]
189     }
190   }
191 ]

Atlas Search 在计算分数时会考虑以下BM25Similarity因素：

boost

提高术语的重要性。

freq

查询词的频率。

idf

查询的反向文档频率。 Atlas Search 使用以下公式计算频率：

log(1 + (N - n + 0.5) / (n + 0.5))

其中：

N 是包含该字段的文档总数。
n 是包含该术语的文档数量。

tf

术语频率。Atlas Search 使用以下公式计算频率：

freq / (freq + k1 * (1 - b + b * dl / avgdl))

其中：

freq 是该词语在文档中出现的次数。
k1 是内部指定的术语饱和度参数。它会影响每次出现该术语时分数增加的程度。
avgdl 是所有文档中字段的平均长度。
dl 是文档中字段的长度。
b 是长度归一化参数，也是在内部设置的。 b乘以dl与avgdl的比率。如果b增加，则dl与avgdl的比率的影响会放大。

以下示例使用 near 运算符查询 sample_mflix.movies 集合中的 released 字段，以查找接近 2010 年 1 月 01 日上映的电影。该查询在 $search 阶段指定 scoreDetails 选项，以检索结果中每个文档的得分明细。该查询使用 $limit 阶段将结果限制为三个文档，并使用 $project 阶段执行以下操作：

排除_id字段。
仅包含 title 和 released 字段。
将score字段添加到结果中以返回文档的分数，并将scoreDetails字段添加到结果中以返回文档分数的明细。

1 db.movies.aggregate([
2   {
3     "$search": {
4       "near": {
5         "path": "released",
6         "origin": ISODate("2010-01-01T00:00:00.000+00:00"),
7         "pivot": 7776000000
8       },
9       "scoreDetails": true
10     }
11   },
12   {
13      "$limit": 3
14   },
15   {
16      "$project": {
17         "_id": 0,
18         "title": 1,
19         "released": 1,
20         "score": { "$meta": "searchScore" },
21         "scoreDetails": { "$meta": "searchScoreDetails" }
22      }
23   }
24 ])

1 [
2   {
3     title: 'Tony',
4     released: ISODate("2010-01-01T00:00:00.000Z"),
5     score: 1,
6     scoreDetails: {
7       value: 1,
8       description: 'Distance score, computed as weight * pivotDistance / (pivotDistance + abs(value - origin)) from:',
9       details: [
10         { value: 1, description: 'weight', details: [] },
11         {
12           value: 7776000000,
13           description: 'pivotDistance',
14           details: []
15         },
16         { value: 1262303969280, description: 'origin', details: [] },
17         {
18           value: 1262303969280,
19           description: 'current value',
20           details: []
21         }
22       ]
23     }
24   },
25  {
26     title: 'And Everything Is Going Fine',
27     released: ISODate("2010-01-01T00:00:00.000Z"),
28     score: 1,
29     scoreDetails: {
30       value: 1,
31       description: 'Distance score, computed as weight * pivotDistance / (pivotDistance + abs(value - origin)) from:',
32       details: [
33         { value: 1, description: 'weight', details: [] },
34         {
35           value: 7776000000,
36           description: 'pivotDistance',
37           details: []
38         },
39         { value: 1262303969280, description: 'origin', details: [] },
40         {
41           value: 1262303969280,
42           description: 'current value',
43           details: []
44         }
45       ]
46     }
47   },
48   {
49     title: 'A Film with Me in It',
50     released: ISODate("2010-01-01T00:00:00.000Z")
51     score: 1,
52     scoreDetails: {
53       value: 1,
54       description: 'Distance score, computed as weight * pivotDistance / (pivotDistance + abs(value - origin)) from:',
55       details: [
56         { value: 1, description: 'weight', details: [] },
57         {
58           value: 7776000000,
59           description: 'pivotDistance',
60           details: []
61         },
62         { value: 1262303969280, description: 'origin', details: [] },
63         {
64           value: 1262303969280,
65           description: 'current value',
66           details: []
67         }
68       ]
69     }
70   }
71 ]

对于距离得分，Atlas Search 会考虑以下因素来计算得分：

`origin`	要搜索附近的值。这是测量结果接近度的原点。
`fieldValue`	您在文档中查询的字段的值。`fieldValue`越接近`origin` ，邻近查询的分数就越高。
`pivot`	指定为参考点的值，如果`fieldValue`和`origin`之间的距离等于`0.5` ，则分数等于该值。这定义了随着`fieldValue`和`origin`之间的距离增加，分数衰减的速度。对于`fieldValue`和`origin`之间的给定距离，如果`pivot`减小，则分数也会减小。

以下示例使用复合操作符，通过以下子句查询 sample_mflix.movies 集合中的电影：

filter 用于查找标题中包含 friend 一词的电影的子句。
must 子句查找 2000 和 2015 年之间上映的电影。
mustNot 子句查找不属于 Short、Western 和 Biography 类型的电影。

该查询在 $search 阶段指定 scoreDetails 选项，以检索结果中每个文档分数的详细明细。该查询使用 $limit 阶段将结果限制为三份文档，并使用 $project 阶段执行以下操作：

排除_id字段。
仅包含 title、released 和 genres 字段。
将score字段添加到结果中以返回文档的分数，并将scoreDetails字段添加到结果中以返回文档分数的明细。

1 db.movies.aggregate([
2   {
3     "$search": {
4       "compound": {
5         "filter": [{
6           "text": {
7             "query": "friend",
8             "path": "title"
9           }
10         }],
11         "must": [{
12           "range": {
13             "path": "year",
14             "gte": 2000,
15             "lte": 2015
16           }
17         }],
18         "mustNot": [{
19           "text": {
20             "query": ["Short, Western", "Biography"],
21             "path": "genres"
22           }
23         }]
24       },
25       "scoreDetails": true
26     }
27   },
28   {
29     "$limit": 3
30   },
31   {
32     "$project": {
33       "_id": 0,
34       "title": 1,
35       "released": 1,
36       "genres": 1,
37       "score": { "$meta": "searchScore" },
38       "scoreDetails": { "$meta": "searchScoreDetails" }
39     }
40   }
41 ])

1 [
2   {
3     genres: [ 'Comedy', 'Drama', 'Mystery' ],
4     title: 'With a Friend Like Harry...',
5     released: ISODate("2001-06-15T00:00:00.000Z"),
6     score: 1,
7     scoreDetails: {
8       value: 1,
9       description: 'sum of:',
10       details: [
11         {
12           value: 0,
13           description: 'match on required clause, product of:',
14           details: [
15             { value: 0, description: '# clause', details: [] },
16             {
17               value: 1,
18               description: '$type:string/title:friend',
19               details: []
20             }
21           ]
22         },
23         {
24           value: 1,
25           description: 'sum of:',
26           details: [
27             {
28               value: 1,
29               description: 'sum of:',
30               details: [
31                 {
32                   value: 1,
33                   description: '$type:double/year:[4656510908468559872 TO 4656576879166226432]',
34                   details: []
35                 }
36               ]
37             }
38           ]
39         }
40       ]
41     }
42   },
43   {
44     genres: [ 'Drama' ],
45     title: 'My Friend Henry',
46     released: ISODate("2004-08-20T00:00:00.000Z"),
47     score: 1,
48     scoreDetails: {
49       value: 1,
50       description: 'sum of:',
51       details: [
52         {
53           value: 0,
54           description: 'match on required clause, product of:',
55           details: [
56             { value: 0, description: '# clause', details: [] },
57             {
58               value: 1,
59               description: '$type:string/title:friend',
60               details: []
61             }
62           ]
63         },
64         {
65           value: 1,
66           description: 'sum of:',
67           details: [
68             {
69               value: 1,
70               description: 'sum of:',
71               details: [
72                 {
73                   value: 1,
74                   description: '$type:double/year:[4656510908468559872 TO 4656576879166226432]',
75                   details: []
76                 }
77               ]
78             }
79           ]
80         }
81       ]
82     }
83   },
84   {
85     genres: [ 'Comedy', 'Drama' ],
86     title: 'A Friend of Mine',
87     released: ISODate("2006-10-26T00:00:00.000Z"),
88     score: 1,
89     scoreDetails: {
90       value: 1,
91       description: 'sum of:',
92       details: [
93         {
94           value: 0,
95           description: 'match on required clause, product of:',
96           details: [
97             { value: 0, description: '# clause', details: [] },
98             {
99               value: 1,
100               description: '$type:string/title:friend',
101               details: []
102             }
103           ]
104         },
105         {
106           value: 1,
107           description: 'sum of:',
108           details: [
109             {
110               value: 1,
111               description: 'sum of:',
112               details: [
113                 {
114                   value: 1,
115                   description: '$type:double/year:[4656510908468559872 TO 4656576879166226432]',
116                   details: []
117                 }
118               ]
119             }
120           ]
121         }
122       ]
123     }
124   }
125 ]

注意

15、56 和 97 行结果中的 # clause 代表复合查询 filter 子句，它对文档的得分没有任何贡献。

下面的示例使用 embeddedDocument 操作符在 sample_training.companies 集合中的 products.name 字段中查询包含 Basic 字段（前面有任意数量的其他字符）的产品。查询在 embeddedDocument 操作符中指定返回的 score 必须是所有匹配的嵌入式文档的总和。该查询还在 $search 阶段指定 scoreDetails 选项，以检索结果中每个文档分数的详细明细。该查询使用 $limit 阶段将结果限制为三个文档，并使用 $project 阶段执行以下操作：

排除_id字段。
仅包含products.name字段。
将score字段添加到结果中以返回文档的分数，并将scoreDetails字段添加到结果中以返回文档分数的明细。

1 db.companies.aggregate({
2   "$search": {
3     "embeddedDocument": {
4       "path": "products",
5       "operator": {
6         "wildcard": {
7           "path": "products.name",
8           "query": "*Basic",
9           "allowAnalyzedField": true
10         }
11      },
12       "score": {
13         "embedded": {
14           "aggregate": "sum"
15         }
16       }
17     },
18     "scoreDetails": true
19   }
20 },
21 {
22   "$limit": 3
23 },
24 {
25   "$project": {
26     "_id": 0,
27     "name": 1,
28     "products.name": 1,
29     "score": { "$meta": "searchScore" },
30     "scoreDetails": { "$meta": "searchScoreDetails" }
31   }
32 })

1 [
2   {
3     name: 'Plaxo',
4     products: [
5       { name: 'Plaxo Basic' },
6       { name: 'Plaxo Pulse' },
7       { name: 'Plaxo Personal Assistant' }
8     ],
9     score: 1,
10     scoreDetails: {
11       value: 1,
12       description: 'Score based on 1 child docs in range from 27 to 29, best match:',
13       details: [
14         {
15           value: 1,
16           description: '$embedded:8/products/$type:string/products.name:*Basic',
17           details: []
18         }
19       ]
20     }
21   },
22   {
23     name: 'The Game Creators',
24     products: [
25       { name: 'Dark Basic Professional' },
26       { name: 'FPS Creator' },
27       { name: 'FPS Creator X10' }
28     ],
29     score: 1,
30     scoreDetails: {
31       value: 1,
32       description: 'Score based on 1 child docs in range from 7474 to 7476, best match:',
33       details: [
34         {
35           value: 1,
36           description: '$embedded:8/products/$type:string/products.name:*basic',
37           details: []
38         }
39       ]
40     }
41   },
42   {
43     name: 'Load Impact',
44     products: [
45       { name: 'Load Impact LIGHT' },
46       { name: 'Load Impact BASIC' },
47       { name: 'Load Impact PROFESSIONAL' },
48       { name: 'Load Impact ADVANCED' }
49     ],
50     score: 1,
51     scoreDetails: {
52       value: 1,
53       description: 'Score based on 1 child docs in range from 11545 to 11548, best match:',
54       details: [
55         {
56           value: 1,
57           description: '$embedded:8/products/$type:string/products.name:*basic',
58           details: []
59         }
60       ]
61     }
62   }
63 ]

注意

对于基于范围内子文档的分数，范围内的数字表示 Lucene 在后台索引的父文档和子文档的 ID。子文档中的 description （在第 16 行、 36 行和 57 行）显示路径的内部表示形式。

自定义分数示例

以下示例演示如何使用$searchscoreDetails sample_mflix.movies选项检索针对collection的函数表达式示例查询结果中的文档的分数明细。

1 db.movies.aggregate([{
2   "$search": {
3     "text": {
4       "path": "title",
5       "query": "men",
6       "score": {
7         "function":{
8           "multiply":[
9             {
10               "path": {
11                 "value": "imdb.rating",
12                 "undefined": 2
13               }
14             },
15             {
16               "score": "relevance"
17             }
18           ]
19         }
20       }
21     },
22     "scoreDetails": true
23   }
24 },
25 {
26   $limit: 5
27 },
28 {
29   $project: {
30     "_id": 0,
31     "title": 1,
32     "score": { "$meta": "searchScore" },
33     "scoreDetails": {"$meta": "searchScoreDetails"}
34   }
35 }])

[
  {
    title: 'Men...',
    score: 23.431293487548828,
    scoreDetails: {
      value: 23.431293487548828,
      description: 'FunctionScoreQuery($type:string/title:men, scored by (imdb.rating * scores)) [BM25Similarity], result of:',
      details: [
        {
          value: 23.431293487548828,
          description: '(imdb.rating * scores)',
          details: []
        }
      ]
    }
  },
  {
    title: '12 Angry Men',
    score: 22.080968856811523,
    scoreDetails: {
      value: 22.080968856811523,
      description: 'FunctionScoreQuery($type:string/title:men, scored by (imdb.rating * scores)) [BM25Similarity], result of:',
      details: [
        {
          value: 22.080968856811523,
          description: '(imdb.rating * scores)',
          details: []
        }
      ]
    }
  },
  {
    title: 'X-Men',
    score: 21.34803581237793,
    scoreDetails: {
      value: 21.34803581237793,
      description: 'FunctionScoreQuery($type:string/title:men, scored by (imdb.rating * scores)) [BM25Similarity], result of:',
      details: [
        {
          value: 21.34803581237793,
          description: '(imdb.rating * scores)',
          details: []
        }
      ]
    }
  },
  {
    title: 'X-Men',
    score: 21.34803581237793,
    scoreDetails: {
      value: 21.34803581237793,
      description: 'FunctionScoreQuery($type:string/title:men, scored by (imdb.rating * scores)) [BM25Similarity], result of:',
      details: [
        {
          value: 21.34803581237793,
          description: '(imdb.rating * scores)',
          details: []
        }
      ]
    }
  },
  {
    title: 'Matchstick Men',
    score: 21.05954933166504,
    scoreDetails: {
      value: 21.05954933166504,
      description: 'FunctionScoreQuery($type:string/title:men, scored by (imdb.rating * scores)) [BM25Similarity], result of:',
      details: [
        {
          value: 21.05954933166504,
          description: '(imdb.rating * scores)',
          details: []
        }
      ]
    }
  }
]

1 db.movies.aggregate([
2   {
3     "$search": {
4       "text": {
5         "path": "title",
6         "query": "men",
7         "score": {
8           "function":{
9             "constant": 3
10           }
11         }
12       },
13       "scoreDetails": true
14     }
15   },
16   {
17     $limit: 5
18   },
19   {
20     $project: {
21       "_id": 0,
22       "title": 1,
23       "score": { "$meta": "searchScore" },
24       "scoreDetails": {"$meta": "searchScoreDetails"}
25     }
26   }
27 ])

[
  {
    title: 'Men Without Women',
    score: 3,
    scoreDetails: {
      value: 3,
      description: 'FunctionScoreQuery($type:string/title:men, scored by constant(3.0)) [BM25Similarity], result of:',
      details: [ { value: 3, description: 'constant(3.0)', details: [] } ]
    }
  },
  {
    title: 'One Hundred Men and a Girl',
    score: 3,
    scoreDetails: {
      value: 3,
      description: 'FunctionScoreQuery($type:string/title:men, scored by constant(3.0)) [BM25Similarity], result of:',
      details: [ { value: 3, description: 'constant(3.0)', details: [] } ]
    }
  },
  {
    title: 'Of Mice and Men',
    score: 3,
    scoreDetails: {
      value: 3,
      description: 'FunctionScoreQuery($type:string/title:men, scored by constant(3.0)) [BM25Similarity], result of:',
      details: [ { value: 3, description: 'constant(3.0)', details: [] } ]
    }
  },
  {
    title: "All the King's Men",
    score: 3,
    scoreDetails: {
      value: 3,
      description: 'FunctionScoreQuery($type:string/title:men, scored by constant(3.0)) [BM25Similarity], result of:',
      details: [ { value: 3, description: 'constant(3.0)', details: [] } ]
    }
  },
  {
    title: 'The Men',
    score: 3,
    scoreDetails: {
      value: 3,
      description: 'FunctionScoreQuery($type:string/title:men, scored by constant(3.0)) [BM25Similarity], result of:',
      details: [ { value: 3, description: 'constant(3.0)', details: [] } ]
    }
  }
]

1 db.movies.aggregate([
2   {
3     "$search": {
4       "text": {
5         "path": "title",
6         "query": "shop",
7         "score": {
8           "function":{
9             "gauss": {
10               "path": {
11                 "value": "imdb.rating",
12                 "undefined": 4.6
13               },
14               "origin": 9.5,
15               "scale": 5,
16               "offset": 0,
17               "decay": 0.5
18             }
19           }
20         }
21       },
22       "scoreDetails": true
23     }
24   },
25   {
26     "$limit": 10
27   },
28   {
29     "$project": {
30       "_id": 0,
31       "title": 1,
32       "score": { "$meta": "searchScore" },
33       "scoreDetails": {"$meta": "searchScoreDetails"}
34     }
35   }
36 ])

[
  {
    title: 'The Shop Around the Corner',
    score: 0.9471074342727661,
    scoreDetails: {
      value: 0.9471074342727661,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9471074342727661,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  },
  {
    title: 'Exit Through the Gift Shop',
    score: 0.9471074342727661,
    scoreDetails: {
      value: 0.9471074342727661,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9471074342727661,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  },
  {
    title: 'The Shop on Main Street',
    score: 0.9395227432250977,
    scoreDetails: {
      value: 0.9395227432250977,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9395227432250977,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  },
  {
    title: 'Chop Shop',
    score: 0.8849083781242371,
    scoreDetails: {
      value: 0.8849083781242371,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.8849083781242371,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  },
  {
    title: 'Little Shop of Horrors',
    score: 0.8290896415710449,
    scoreDetails: {
      value: 0.8290896415710449,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.8290896415710449,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  },
  {
    title: 'The Suicide Shop',
    score: 0.7257778644561768,
    scoreDetails: {
      value: 0.7257778644561768,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.7257778644561768,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  },
  {
    title: 'A Woman, a Gun and a Noodle Shop',
    score: 0.6559237241744995,
    scoreDetails: {
      value: 0.6559237241744995,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.6559237241744995,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  },
  {
    title: 'Beauty Shop',
    score: 0.6274620294570923,
    scoreDetails: {
      value: 0.6274620294570923,
      description: 'FunctionScoreQuery($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.6274620294570923,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  }
]

1 db.movies.aggregate([{
2   "$search": {
3     "text": {
4       "path": "title",
5       "query": "men",
6       "score": {
7         "function":{
8           "path": {
9             "value": "imdb.rating",
10             "undefined": 4.6
11           }
12         }
13       }
14     },
15     "scoreDetails": true
16   }
17 },
18 {
19   $limit: 5
20 },
21 {
22   $project: {
23     "_id": 0,
24     "title": 1,
25     "score": { "$meta": "searchScore" },
26     "scoreDetails": {"$meta": "searchScoreDetails"}
27   }
28 }])

[
  {
    title: '12 Angry Men',
    score: 8.899999618530273,
    scoreDetails: {
      value: 8.899999618530273,
      description: 'FunctionScoreQuery($type:string/title:men, scored by imdb.rating) [BM25Similarity], result of:',
      details: [
        {
          value: 8.899999618530273,
          description: 'imdb.rating',
          details: []
        }
      ]
    }
  },
  {
    title: 'The Men Who Built America',
    score: 8.600000381469727,
    scoreDetails: {
      value: 8.600000381469727,
      description: 'FunctionScoreQuery($type:string/title:men, scored by imdb.rating) [BM25Similarity], result of:',
      details: [
        {
          value: 8.600000381469727,
          description: 'imdb.rating',
          details: []
        }
      ]
    }
  },
  {
    title: 'No Country for Old Men',
    score: 8.100000381469727,
    scoreDetails: {
      value: 8.100000381469727,
      description: 'FunctionScoreQuery($type:string/title:men, scored by imdb.rating) [BM25Similarity], result of:',
      details: [
        {
          value: 8.100000381469727,
          description: 'imdb.rating',
          details: []
        }
      ]
    }
  },
  {
    title: 'X-Men: Days of Future Past',
    score: 8.100000381469727,
    scoreDetails: {
      value: 8.100000381469727,
      description: 'FunctionScoreQuery($type:string/title:men, scored by imdb.rating) [BM25Similarity], result of:',
      details: [
        {
          value: 8.100000381469727,
          description: 'imdb.rating',
          details: []
        }
      ]
    }
  },
  {
    title: 'The Best of Men',
    score: 8.100000381469727,
    scoreDetails: {
      value: 8.100000381469727,
      description: 'FunctionScoreQuery($type:string/title:men, scored by imdb.rating) [BM25Similarity], result of:',
      details: [
        {
          value: 8.100000381469727,
          description: 'imdb.rating',
          details: []
        }
      ]
    }
  }
]

1 db.movies.aggregate([{
2   "$search": {
3     "text": {
4       "path": "title",
5       "query": "men",
6       "score": {
7         "function":{
8           "score": "relevance"
9         }
10       }
11     },
12     "scoreDetails": true
13   }
14 },
15 {
16   $limit: 5
17 },
18 {
19   $project: {
20     "_id": 0,
21     "title": 1,
22     "score": { "$meta": "searchScore" },
23     "scoreDetails": {"$meta": "searchScoreDetails"}
24   }
25 }])

[
  {
    title: 'Men...',
    score: 3.4457783699035645,
    scoreDetails: {
      value: 3.4457783699035645,
      description: 'FunctionScoreQuery($type:string/title:men, scored by scores) [BM25Similarity], result of:',
      details: [
        {
          value: 3.4457783699035645,
          description: 'weight($type:string/title:men in 4705) [BM25Similarity], result of:',
          details: [
            {
              value: 3.4457783699035645,
              description: 'score(freq=1.0), computed as boost * idf * tf from:',
              details: [
                {
                  value: 5.5606818199157715,
                  description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
                  details: [
                    {
                      value: 90,
                      description: 'n, number of documents containing term',
                      details: []
                    },
                    {
                      value: 23529,
                      description: 'N, total number of documents with field',
                      details: []
                    }
                  ]
                },
                {
                  value: 0.6196683645248413,
                  description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
                  details: [
                    {
                      value: 1,
                      description: 'freq, occurrences of term within document',
                      details: []
                    },
                    {
                      value: 1.2000000476837158,
                      description: 'k1, term saturation parameter',
                      details: []
                    },
                    {
                      value: 0.75,
                      description: 'b, length normalization parameter',
                     details: []
                    },
                    {
                      value: 1,
                      description: 'dl, length of field',
                      details: []
                    },
                    {
                      value: 2.868375301361084,
                      description: 'avgdl, average length of field',
                      details: []
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  },
  {
    title: 'The Men',
    score: 2.8848698139190674,
    scoreDetails: {
      value: 2.8848698139190674,
      description: 'FunctionScoreQuery($type:string/title:men, scored by scores) [BM25Similarity], result of:',
      details: [
        {
          value: 2.8848698139190674,
          description: 'weight($type:string/title:men in 870) [BM25Similarity], result of:',
          details: [
            {
              value: 2.8848698139190674,
              description: 'score(freq=1.0), computed as boost * idf * tf from:',
              details: [
                {
                  value: 5.5606818199157715,
                  description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
                  details: [
                    {
                      value: 90,
                      description: 'n, number of documents containing term',
                      details: []
                    },
                    {
                      value: 23529,
                      description: 'N, total number of documents with field',
                      details: []
                    }
                  ]
                },
                {
                  value: 0.5187978744506836,
                  description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
                  details: [
                    {
                      value: 1,
                      description: 'freq, occurrences of term within document',
                      details: []
                    },
                    {
                      value: 1.2000000476837158,
                      description: 'k1, term saturation parameter',
                      details: []
                    },
                    {
                      value: 0.75,
                      description: 'b, length normalization parameter',
                      details: []
                    },
                    {
                      value: 2,
                      description: 'dl, length of field',
                      details: []
                    },
                    {
                      value: 2.868375301361084,
                      description: 'avgdl, average length of field',
                      details: []
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  },
  {
    title: 'Simple Men',
    score: 2.8848698139190674,
    scoreDetails: {
      value: 2.8848698139190674,
      description: 'FunctionScoreQuery($type:string/title:men, scored by scores) [BM25Similarity], result of:',
      details: [
        {
          value: 2.8848698139190674,
          description: 'weight($type:string/title:men in 6371) [BM25Similarity], result of:',
          details: [
            {
              value: 2.8848698139190674,
              description: 'score(freq=1.0), computed as boost * idf * tf from:',
              details: [
                {
                  value: 5.5606818199157715,
                  description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
                  details: [
                    {
                      value: 90,
                      description: 'n, number of documents containing term',
                      details: []
                    },
                    {
                      value: 23529,
                      description: 'N, total number of documents with field',
                      details: []
                    }
                  ]
                },
                {
                  value: 0.5187978744506836,
                  description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
                  details: [
                    {
                      value: 1,
                      description: 'freq, occurrences of term within document',
                      details: []
                    },
                    {
                      value: 1.2000000476837158,
                      description: 'k1, term saturation parameter',
                      details: []
                    },
                    {
                      value: 0.75,
                      description: 'b, length normalization parameter',
                      details: []
                    },
                    {
                      value: 2,
                      description: 'dl, length of field',
                      details: []
                    },
                    {
                      value: 2.868375301361084,
                      description: 'avgdl, average length of field',
                      details: []
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  },
  {
    title: 'X-Men',
    score: 2.8848698139190674,
    scoreDetails: {
      value: 2.8848698139190674,
      description: 'FunctionScoreQuery($type:string/title:men, scored by scores) [BM25Similarity], result of:',
      details: [
        {
          value: 2.8848698139190674,
          description: 'weight($type:string/title:men in 8368) [BM25Similarity], result of:',
          details: [
            {
              value: 2.8848698139190674,
              description: 'score(freq=1.0), computed as boost * idf * tf from:',
              details: [
                {
                  value: 5.5606818199157715,
                  description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
                  details: [
                    {
                      value: 90,
                      description: 'n, number of documents containing term',
                      details: []
                    },
                    {
                      value: 23529,
                      description: 'N, total number of documents with field',
                      details: []
                    }
                  ]
                },
                {
                  value: 0.5187978744506836,
                  description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
                  details: [
                    {
                      value: 1,
                      description: 'freq, occurrences of term within document',
                      details: []
                    },
                    {
                      value: 1.2000000476837158,
                      description: 'k1, term saturation parameter',
                      details: []
                    },
                    {
                      value: 0.75,
                      description: 'b, length normalization parameter',
                      details: []
                    },
                    {
                      value: 2,
                      description: 'dl, length of field',
                      details: []
                    },
                    {
                      value: 2.868375301361084,
                      description: 'avgdl, average length of field',
                      details: []
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  },
  {
    title: 'Mystery Men',
    score: 2.8848698139190674,
    scoreDetails: {
      value: 2.8848698139190674,
      description: 'FunctionScoreQuery($type:string/title:men, scored by scores) [BM25Similarity], result of:',
      details: [
        {
          value: 2.8848698139190674,
          description: 'weight($type:string/title:men in 8601) [BM25Similarity], result of:',
          details: [
            {
              value: 2.8848698139190674,
              description: 'score(freq=1.0), computed as boost * idf * tf from:',
              details: [
                {
                  value: 5.5606818199157715,
                  description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
                  details: [
                    {
                      value: 90,
                      description: 'n, number of documents containing term',
                      details: []
                    },
                    {
                      value: 23529,
                      description: 'N, total number of documents with field',
                      details: []
                    }
                  ]
                },
                {
                  value: 0.5187978744506836,
                  description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
                  details: [
                    {
                      value: 1,
                      description: 'freq, occurrences of term within document',
                      details: []
                    },
                    {
                      value: 1.2000000476837158,
                      description: 'k1, term saturation parameter',
                      details: []
                    },
                    {
                      value: 0.75,
                      description: 'b, length normalization parameter',
                      details: []
                    },
                    {
                      value: 2,
                      description: 'dl, length of field',
                      details: []
                    },
                    {
                      value: 2.868375301361084,
                      description: 'avgdl, average length of field',
                      details: []
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  }
]

1 db.movies.aggregate([{
2   "$search": {
3     "text": {
4       "path": "title",
5       "query": "men",
6       "score": {
7         "function": {
8           "log": {
9             "path": {
10               "value": "imdb.rating",
11               "undefined": 10
12             }
13           }
14         }
15       }
16     },
17     "scoreDetails": true
18   }
19 },
20 {
21   $limit: 5
22 },
23 {
24   $project: {
25     "_id": 0,
26     "title": 1,
27     "score": { "$meta": "searchScore" },
28     "scoreDetails": {"$meta": "searchScoreDetails"}
29   }
30 }])

[
  {
    title: '12 Angry Men',
    score: 0.9493899941444397,
    scoreDetails: {
      value: 0.9493899941444397,
      description: 'FunctionScoreQuery($type:string/title:men, scored by log(imdb.rating)) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9493899941444397,
          description: 'log(imdb.rating)',
          details: []
        }
      ]
    }
  },
  {
    title: 'The Men Who Built America',
    score: 0.9344984292984009,
    scoreDetails: {
      value: 0.9344984292984009,
      description: 'FunctionScoreQuery($type:string/title:men, scored by log(imdb.rating)) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9344984292984009,
          description: 'log(imdb.rating)',
          details: []
        }
      ]
    }
  },
  {
    title: 'No Country for Old Men',
    score: 0.9084849953651428,
    scoreDetails: {
      value: 0.9084849953651428,
      description: 'FunctionScoreQuery($type:string/title:men, scored by log(imdb.rating)) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9084849953651428,
          description: 'log(imdb.rating)',
          details: []
        }
      ]
    }
  },
  {
    title: 'X-Men: Days of Future Past',
    score: 0.9084849953651428,
    scoreDetails: {
      value: 0.9084849953651428,
      description: 'FunctionScoreQuery($type:string/title:men, scored by log(imdb.rating)) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9084849953651428,
          description: 'log(imdb.rating)',
          details: []
        }
      ]
    }
  },
  {
    title: 'The Best of Men',
    score: 0.9084849953651428,
    scoreDetails: {
      value: 0.9084849953651428,
      description: 'FunctionScoreQuery($type:string/title:men, scored by log(imdb.rating)) [BM25Similarity], result of:',
      details: [
        {
          value: 0.9084849953651428,
          description: 'log(imdb.rating)',
          details: []
        }
      ]
    }
  }
]

后退

修改分数

来年

对分数进行规范化

1	db.movies.aggregate([
2	{
3	"$search": {
4	"text": {
5	"path": "title",
6	"query": "autumn"
7	},
8	"scoreDetails": true
9	}
10	},
11	{
12	"$limit": 3
13	},
14	{
15	"$project": {
16	"_id": 0,
17	"title": 1,
18	"score": { "$meta": "searchScore" },
19	"scoreDetails": { "$meta": "searchScoreDetails" }
20	}
21	}
22	])

1	[
2	{
3	title: 'Autumn Leaves',
4	score: 3.834893226623535,
5	scoreDetails: {
6	value: 3.834893226623535,
7	description: '$type:string/title:autumn [BM25Similarity], result of:',
8	details: [
9	{
10	value: 3.834893226623535,
11	description: 'score(freq=1.0), computed as boost * idf * tf from:',
12	details: [
13	{
14	value: 7.39188289642334,
15	description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
16	details: [
17	{
18	value: 14,
19	description: 'n, number of documents containing term',
20	details: []
21	},
22	{
23	value: 23529,
24	description: 'N, total number of documents with field',
25	details: []
26	}
27	]
28	},
29	{
30	value: 0.5187978744506836,
31	description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
32	details: [
33	{
34	value: 1,
35	description: 'freq, occurrences of term within document',
36	details: []
37	},
38	{
39	value: 1.2000000476837158,
40	description: 'k1, term saturation parameter',
41	details: []
42	},
43	{
44	value: 0.75,
45	description: 'b, length normalization parameter',
46	details: []
47	},
48	{
49	value: 2,
50	description: 'dl, length of field',
51	details: []
52	},
53	{
54	value: 2.868375301361084,
55	description: 'avgdl, average length of field',
56	details: []
57	}
58	]
59	}
60	]
61	}
62	]
63	}
64	},
65	{
66	title: 'Late Autumn',
67	score: 3.834893226623535,
68	scoreDetails: {
69	value: 3.834893226623535,
70	description: '$type:string/title:autumn [BM25Similarity], result of:',
71	details: [
72	{
73	value: 3.834893226623535,
74	description: 'score(freq=1.0), computed as boost * idf * tf from:',
75	details: [
76	{
77	value: 7.39188289642334,
78	description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
79	details: [
80	{
81	value: 14,
82	description: 'n, number of documents containing term',
83	details: []
84	},
85	{
86	value: 23529,
87	description: 'N, total number of documents with field',
88	details: []
89	}
90	]
91	},
92	{
93	value: 0.5187978744506836,
94	description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
95	details: [
96	{
97	value: 1,
98	description: 'freq, occurrences of term within document',
99	details: []
100	},
101	{
102	value: 1.2000000476837158,
103	description: 'k1, term saturation parameter',
104	details: []
105	},
106	{
107	value: 0.75,
108	description: 'b, length normalization parameter',
109	details: []
110	},
111	{
112	value: 2,
113	description: 'dl, length of field',
114	details: []
115	},
116	{
117	value: 2.868375301361084,
118	description: 'avgdl, average length of field',
119	details: []
120	}
121	]
122	}
123	]
124	}
125	]
126	}
127	},
128	{
129	title: 'Cheyenne Autumn',
130	score: 3.834893226623535,
131	scoreDetails: {
132	value: 3.834893226623535,
133	description: '$type:string/title:autumn [BM25Similarity], result of:',
134	details: [
135	{
136	value: 3.834893226623535,
137	description: 'score(freq=1.0), computed as boost * idf * tf from:',
138	details: [
139	{
140	value: 7.39188289642334,
141	description: 'idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:',
142	details: [
143	{
144	value: 14,
145	description: 'n, number of documents containing term',
146	details: []
147	},
148	{
149	value: 23529,
150	description: 'N, total number of documents with field',
151	details: []
152	}
153	]
154	},
155	{
156	value: 0.5187978744506836,
157	description: 'tf, computed as freq / (freq + k1 * (1 - b + b * dl / avgdl)) from:',
158	details: [
159	{
160	value: 1,
161	description: 'freq, occurrences of term within document',
162	details: []
163	},
164	{
165	value: 1.2000000476837158,
166	description: 'k1, term saturation parameter',
167	details: []
168	},
169	{
170	value: 0.75,
171	description: 'b, length normalization parameter',
172	details: []
173	},
174	{
175	value: 2,
176	description: 'dl, length of field',
177	details: []
178	},
179	{
180	value: 2.868375301361084,
181	description: 'avgdl, average length of field',
182	details: []
183	}
184	]
185	}
186	]
187	}
188	]
189	}
190	}
191	]

1	db.movies.aggregate([
2	{
3	"$search": {
4	"near": {
5	"path": "released",
6	"origin": ISODate("2010-01-01T00:00:00.000+00:00"),
7	"pivot": 7776000000
8	},
9	"scoreDetails": true
10	}
11	},
12	{
13	"$limit": 3
14	},
15	{
16	"$project": {
17	"_id": 0,
18	"title": 1,
19	"released": 1,
20	"score": { "$meta": "searchScore" },
21	"scoreDetails": { "$meta": "searchScoreDetails" }
22	}
23	}
24	])

1	[
2	{
3	title: 'Tony',
4	released: ISODate("2010-01-01T00:00:00.000Z"),
5	score: 1,
6	scoreDetails: {
7	value: 1,
8	description: 'Distance score, computed as weight * pivotDistance / (pivotDistance + abs(value - origin)) from:',
9	details: [
10	{ value: 1, description: 'weight', details: [] },
11	{
12	value: 7776000000,
13	description: 'pivotDistance',
14	details: []
15	},
16	{ value: 1262303969280, description: 'origin', details: [] },
17	{
18	value: 1262303969280,
19	description: 'current value',
20	details: []
21	}
22	]
23	}
24	},
25	{
26	title: 'And Everything Is Going Fine',
27	released: ISODate("2010-01-01T00:00:00.000Z"),
28	score: 1,
29	scoreDetails: {
30	value: 1,
31	description: 'Distance score, computed as weight * pivotDistance / (pivotDistance + abs(value - origin)) from:',
32	details: [
33	{ value: 1, description: 'weight', details: [] },
34	{
35	value: 7776000000,
36	description: 'pivotDistance',
37	details: []
38	},
39	{ value: 1262303969280, description: 'origin', details: [] },
40	{
41	value: 1262303969280,
42	description: 'current value',
43	details: []
44	}
45	]
46	}
47	},
48	{
49	title: 'A Film with Me in It',
50	released: ISODate("2010-01-01T00:00:00.000Z")
51	score: 1,
52	scoreDetails: {
53	value: 1,
54	description: 'Distance score, computed as weight * pivotDistance / (pivotDistance + abs(value - origin)) from:',
55	details: [
56	{ value: 1, description: 'weight', details: [] },
57	{
58	value: 7776000000,
59	description: 'pivotDistance',
60	details: []
61	},
62	{ value: 1262303969280, description: 'origin', details: [] },
63	{
64	value: 1262303969280,
65	description: 'current value',
66	details: []
67	}
68	]
69	}
70	}
71	]

1	db.movies.aggregate([
2	{
3	"$search": {
4	"compound": {
5	"filter": [{
6	"text": {
7	"query": "friend",
8	"path": "title"
9	}
10	}],
11	"must": [{
12	"range": {
13	"path": "year",
14	"gte": 2000,
15	"lte": 2015
16	}
17	}],
18	"mustNot": [{
19	"text": {
20	"query": ["Short, Western", "Biography"],
21	"path": "genres"
22	}
23	}]
24	},
25	"scoreDetails": true
26	}
27	},
28	{
29	"$limit": 3
30	},
31	{
32	"$project": {
33	"_id": 0,
34	"title": 1,
35	"released": 1,
36	"genres": 1,
37	"score": { "$meta": "searchScore" },
38	"scoreDetails": { "$meta": "searchScoreDetails" }
39	}
40	}
41	])

1	[
2	{
3	genres: [ 'Comedy', 'Drama', 'Mystery' ],
4	title: 'With a Friend Like Harry...',
5	released: ISODate("2001-06-15T00:00:00.000Z"),
6	score: 1,
7	scoreDetails: {
8	value: 1,
9	description: 'sum of:',
10	details: [
11	{
12	value: 0,
13	description: 'match on required clause, product of:',
14	details: [
15	{ value: 0, description: '# clause', details: [] },
16	{
17	value: 1,
18	description: '$type:string/title:friend',
19	details: []
20	}
21	]
22	},
23	{
24	value: 1,
25	description: 'sum of:',
26	details: [
27	{
28	value: 1,
29	description: 'sum of:',
30	details: [
31	{
32	value: 1,
33	description: '$type:double/year:[4656510908468559872 TO 4656576879166226432]',
34	details: []
35	}
36	]
37	}
38	]
39	}
40	]
41	}
42	},
43	{
44	genres: [ 'Drama' ],
45	title: 'My Friend Henry',
46	released: ISODate("2004-08-20T00:00:00.000Z"),
47	score: 1,
48	scoreDetails: {
49	value: 1,
50	description: 'sum of:',
51	details: [
52	{
53	value: 0,
54	description: 'match on required clause, product of:',
55	details: [
56	{ value: 0, description: '# clause', details: [] },
57	{
58	value: 1,
59	description: '$type:string/title:friend',
60	details: []
61	}
62	]
63	},
64	{
65	value: 1,
66	description: 'sum of:',
67	details: [
68	{
69	value: 1,
70	description: 'sum of:',
71	details: [
72	{
73	value: 1,
74	description: '$type:double/year:[4656510908468559872 TO 4656576879166226432]',
75	details: []
76	}
77	]
78	}
79	]
80	}
81	]
82	}
83	},
84	{
85	genres: [ 'Comedy', 'Drama' ],
86	title: 'A Friend of Mine',
87	released: ISODate("2006-10-26T00:00:00.000Z"),
88	score: 1,
89	scoreDetails: {
90	value: 1,
91	description: 'sum of:',
92	details: [
93	{
94	value: 0,
95	description: 'match on required clause, product of:',
96	details: [
97	{ value: 0, description: '# clause', details: [] },
98	{
99	value: 1,
100	description: '$type:string/title:friend',
101	details: []
102	}
103	]
104	},
105	{
106	value: 1,
107	description: 'sum of:',
108	details: [
109	{
110	value: 1,
111	description: 'sum of:',
112	details: [
113	{
114	value: 1,
115	description: '$type:double/year:[4656510908468559872 TO 4656576879166226432]',
116	details: []
117	}
118	]
119	}
120	]
121	}
122	]
123	}
124	}
125	]

1	db.companies.aggregate({
2	"$search": {
3	"embeddedDocument": {
4	"path": "products",
5	"operator": {
6	"wildcard": {
7	"path": "products.name",
8	"query": "*Basic",
9	"allowAnalyzedField": true
10	}
11	},
12	"score": {
13	"embedded": {
14	"aggregate": "sum"
15	}
16	}
17	},
18	"scoreDetails": true
19	}
20	},
21	{
22	"$limit": 3
23	},
24	{
25	"$project": {
26	"_id": 0,
27	"name": 1,
28	"products.name": 1,
29	"score": { "$meta": "searchScore" },
30	"scoreDetails": { "$meta": "searchScoreDetails" }
31	}
32	})

1	[
2	{
3	name: 'Plaxo',
4	products: [
5	{ name: 'Plaxo Basic' },
6	{ name: 'Plaxo Pulse' },
7	{ name: 'Plaxo Personal Assistant' }
8	],
9	score: 1,
10	scoreDetails: {
11	value: 1,
12	description: 'Score based on 1 child docs in range from 27 to 29, best match:',
13	details: [
14	{
15	value: 1,
16	description: '$embedded:8/products/$type:string/products.name:*Basic',
17	details: []
18	}
19	]
20	}
21	},
22	{
23	name: 'The Game Creators',
24	products: [
25	{ name: 'Dark Basic Professional' },
26	{ name: 'FPS Creator' },
27	{ name: 'FPS Creator X10' }
28	],
29	score: 1,
30	scoreDetails: {
31	value: 1,
32	description: 'Score based on 1 child docs in range from 7474 to 7476, best match:',
33	details: [
34	{
35	value: 1,
36	description: '$embedded:8/products/$type:string/products.name:*basic',
37	details: []
38	}
39	]
40	}
41	},
42	{
43	name: 'Load Impact',
44	products: [
45	{ name: 'Load Impact LIGHT' },
46	{ name: 'Load Impact BASIC' },
47	{ name: 'Load Impact PROFESSIONAL' },
48	{ name: 'Load Impact ADVANCED' }
49	],
50	score: 1,
51	scoreDetails: {
52	value: 1,
53	description: 'Score based on 1 child docs in range from 11545 to 11548, best match:',
54	details: [
55	{
56	value: 1,
57	description: '$embedded:8/products/$type:string/products.name:*basic',
58	details: []
59	}
60	]
61	}
62	}
63	]

1	db.movies.aggregate([{
2	"$search": {
3	"text": {
4	"path": "title",
5	"query": "men",
6	"score": {
7	"function":{
8	"multiply":[
9	{
10	"path": {
11	"value": "imdb.rating",
12	"undefined": 2
13	}
14	},
15	{
16	"score": "relevance"
17	}
18	]
19	}
20	}
21	},
22	"scoreDetails": true
23	}
24	},
25	{
26	$limit: 5
27	},
28	{
29	$project: {
30	"_id": 0,
31	"title": 1,
32	"score": { "$meta": "searchScore" },
33	"scoreDetails": {"$meta": "searchScoreDetails"}
34	}
35	}])