$search (aggregation)
$search aggregation pipeline stage performs a full-text search of
the field or fields in an Atlas collection. The fields must be covered
by an Atlas Search index. See:
Index Definitions to learn more about creating and managing Atlas Search indexes.
$search Aggregation Pipeline Stage to learn more about the
$searchpipeline stage syntax and usage.$search Operators to learn more about the
$searchaggregation pipeline stage operators.