MongoDB $text search

To perform a text search in MongoDB, you can use the $text operator in a query. The $text operator performs a text search on the string content of the fields indexed with a text index. For example, you could use a query like this to search for documents that contain the word "mongo":
```
db.collection.find({ $text: { $search: "mongo" } })
```
To perform a text search, you must have a text index on your collection. You can create a text index on one or more fields in your collection like this:
```
db.collection.createIndex( { field1: "text", field2: "text" } )
```

Find all documents that contain the word mongo:

db.collection.find({ $text: { $search: "mongo" } })

Find all documents that contain the phrasemongo db:

db.collection.find({ $text: { $search: "\"mongo db\"" } })

Find all documents that contain the word mongo or database:

db.collection.find({ $text: { $search: "mongo database" } })

Find all documents that contain the word mongo and not the word database:
```
db.collection.find({ $text: { $search: "mongo -database" } })
```

Find all documents that contain the word mongo in the field1 field:

db.collection.find({ $text: { $search: "mongo", $field: "field1" } })

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