$searchMeta (aggregation)

searchMeta returns different types of metadata result documents for Atlas Search queries on the field or fields in an Atlas collection. 为Atlas集合中字段的Atlas Search查询返回不同类型的元数据结果文档。The fields must be covered by an Atlas Search index. See:这些字段必须包含在Atlas Search索引中。请参阅：

• Index Definitions索引定义 to learn more about creating and managing Atlas Search indexes.了解有关创建和管理Atlas Search索引的更多信息。
• Atlas Search Aggregation Pipeline StagesAtlas搜索聚合管道阶段 to learn more about the $searchMeta pipeline stage syntax, usage, and results.以了解有关$searchMeta管道阶段语法、用法和结果的更多信息。