Docs 菜单
Docs 主页
/
MongoDB Atlas
/
Atlas Search
/
创建和运行查询
/
创建查询
/
4。对文档进行评分

返回得分详情

在此页面上

  • 语法
  • 选项
  • 输出
  • 影响分数的因素
  • 举例
  • 操作符示例
  • 自定义分数示例

您可以在scoreDetails 阶段使用$search 布尔选项，详细了解查询结果中每个文档的分数。要查看元数据，您必须在 阶段使用 $meta $project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 — 在结果中包含文档分数的详细信息。如果设置为true ，Atlas Search 将返回结果中每个文档的分数明细。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。顶级value显示结果文档的总分数，并且等于$searchScore的值。

评分公式因查询中使用的操作符而异。例如，Atlas Search 对包含 文本 和 邻近 操作符的 复合 查询使用以下评分公式：BM25Similarity + distance decay function 。

description
字符串

评分公式的子集，包括文档评分方式的详细信息以及计算分数时考虑的因素。顶级description显示用于对文档进行评分的完整评分公式。

要了解更多信息，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。

举例

以下示例展示如何在以下结果中检索分数的详细信息：

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在sample_mflix.movies集合中的title字段中查询词语autumn 。该查询在$search阶段指定scoreDetails选项，以检索结果中每个文档的分数明细。该查询使用$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。

1db.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操作符查询sample_mflix.movies集合中的released字段，了解 1 月01 、 2010前后上映的电影。查询在$search阶段指定scoreDetails选项，以检索结果中每个文档的分数明细。该查询使用$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。

1db.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]

对于距离分数，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。

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 子句来查找标题中包含friend一词的电影。

  • 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$search阶段指定scoreDetails选项，以检索结果中每个文档的分数明细。该查询使用$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 、 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。

1db.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

# clause结果中的15 、56 和97 行的 表示 复合 查询filter 子句，该子句对文档的分数没有贡献。

以下示例使用embeddedDocument操作符查询sample_training.companies集合中的products.name字段，查找包含Basic一词且前面带有任意数量的其他字符的产品。该查询在embeddedDocument操作符中指定返回的分数必须是所有匹配的嵌入式文档的总和。该查询还在$search阶段指定scoreDetails选项，以检索结果中每个文档的分数明细。该查询使用$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。

1db.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

对于基于范围内的子文档的分数，范围内的数字表示 Lucene 在幕后索引的父文档和子文档的 ID。子文档中的description （第16 、 36和57行）显示了路径的内部表示。

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。

1db.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: []
        }
      ]
    }
  }
]
1db.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: [] } ]
    }
  }
]
1db.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($type:string/title:shop, scored by exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))) [BM25Similarity], result of:',
      details: [
        {
          value: 0.6274620294570923,
          description: 'exp((max(0, |imdb.rating - 9.5| - 0.0)^2) / 2 * (5.0^2 / 2 * ln(0.5)))',
          details: []
        }
      ]
    }
  }
]
1db.movies.aggregate([{
2  "$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: []
        }
      ]
    }
  }
]
1db.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: []
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  }
]
1db.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