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$search（聚合）
$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.
Atlas Search Aggregation Pipeline Stages to learn more about the
$searchpipeline stage syntax and usage.$search Operators to learn more about the
$searchaggregation pipeline stage operators.
重要
The $search aggregation pipeline stage is only available for collections hosted on MongoDB Atlas cluster tiers running MongoDB version 4.2 or later. To learn more, see Atlas Search.