MongoDB full-text index usage

MongoDB full-text index usage

How to create a full-text index for MongoDB:
Db. ensureIndex ({key: "text "})
Db. ensureIndex ({key1: "text", key2: "text "})
Db. ensureIndex ({"$ **": "text", key2: "text "})

Usage of mongodb full-text index query:
Db. article. find ({$ text: {$ search: "coffee"}) # query documents that contain coffee
Db. article. find ({$ text: {$ search: "aa bb cc"}) # (or query) query documents containing aa, bb, or cc
Db. article. find ({$ text: {$ search: "aa bb-cc"}) #-to exclude documents containing cc content
Db. article. find ({$ text: {$ search: "\" aa \ "\" bb \ "\" cc \ ""}) # (and query) add \ "before the query content to query documents that contain both aa and bb cc.

Full-text index restrictions:
Only one full-text index can be created for a set. Only one $ text query can be specified for each query.
$ Text cannot appear in $ nor Query
If the query contains $ text, $ hint does not work.
Chinese full-text search not supported

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