MongoDB全文搜索——目前尚不支持针对特定field的搜索

> db.articles.createIndex( { subject: "text" } )
{
        "createdCollectionAutomatically" : true,
        "numIndexesBefore" : ,
        "numIndexesAfter" : ,
        "ok" :
}
> db.articles.insert(
...    [
...      { _id: , subject: "coffee", author: "xyz", views:  },
...      { _id: , subject: "Coffee Shopping", author: "efg", views:  },
...      { _id: , subject: "Baking a cake", author: "abc", views:   },
...      { _id: , subject: "baking", author: "xyz", views:  },
...      { _id: , subject: "Caf Con Leche", author: "abc", views:  },
...      { _id: , subject: ".......", author: "jkl", views:  },
...      { _id: , subject: "coffee and cream", author: "efg", views:  },
...      { _id: , subject: "Cafe con Leche", author: "xyz", views:  }
...    ]
... )
BulkWriteResult({
        "writeErrors" : [ ],
        "writeConcernErrors" : [ ],
        "nInserted" : ,
        "nUpserted" : ,
        "nMatched" : ,
        "nModified" : ,
        "nRemoved" : ,
        "upserted" : [ ]
})
> db.articles.find( { $text: { $search: "coffee" } } )
{ "_id" : , "subject" : "Coffee Shopping", "author" : "efg", "views" :  }
{ "_id" : , "subject" : "coffee and cream", "author" : "efg", "views" :  }
{ "_id" : , "subject" : "coffee", "author" : "xyz", "views" :  }> db.articles.find( { $text: { $search: "\"coffee shop\"" } } )
{ "_id" : , "subject" : "Coffee Shopping", "author" : "efg", "views" :  }
> db.articles.find( { $text: { $search: "\"coffee\" \"shop\"" } } )
{ "_id" : , "subject" : "Coffee Shopping", "author" : "efg", "views" :  }
> db.articles.find( { $text: { $search: "coffee shop" } } )
{ "_id" : , "subject" : "Coffee Shopping", "author" : "efg", "views" :  }
{ "_id" : , "subject" : "coffee and cream", "author" : "efg", "views" :  }
{ "_id" : , "subject" : "coffee", "author" : "xyz", "views" :  }

参考：https://docs.mongodb.com/manual/reference/operator/query/text/