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
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.
$searchMeta aggregation pipeline stage is only available for
collections hosted on MongoDB Atlas cluster tiers
running MongoDB version 4.4.9 or later. To learn more, see