searchMeta returns different types of metadata result documents for Atlas Search queries on 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
$searchMetapipeline stage syntax, usage, and results.
Important
The $searchMeta aggregation pipeline stage is only available for collections hosted on MongoDB Atlas. To learn more, see Atlas Search.