> db.posts.insert({
   "post_text": "enjoy the mongodb articles on tutorialspoint",
   "tags": ["mongodb", "tutorialspoint"]
}
{
    "post_text" : "writing tutorials on mongodb",
    "tags" : [ "mongodb", "tutorial" ]
})
WriteResult({ "nInserted" : 1 })

>db.posts.createIndex({post_text:"text"})
{
    "createdCollectionAutomatically" : true,
    "numIndexesBefore" : 1,
    "numIndexesAfter" : 2,
    "ok" : 1
}

> db.posts.find({text:{search:"tutorialspoint"}}).pretty()
{
    "_id" : ObjectId("5dd7ce28f1dd4583e7103fe0"),
    "post_text" : "enjoy the mongodb articles on tutorialspoint",
    "tags" : [
        "mongodb",
        "tutorialspoint"
    ]
}

{ 
   "_id" : ObjectId("53493d14d852429c10000002"), 
   "post_text" : "enjoy the mongodb articles on tutorialspoint", 
   "tags" : [ "mongodb", "tutorialspoint" ]
}

>db.posts.getIndexes()
[
    {
        "v" : 2,
        "key" : {
            "_id" : 1
        },
        "name" : "_id_",
        "ns" : "mydb.posts"
    },
    {
        "v" : 2,
        "key" : {
            "fts" : "text",
            "ftsx" : 1
        },
        "name" : "post_text_text",
        "ns" : "mydb.posts",
        "weights" : {
            "post_text" : 1
        },
        "default_language" : "english",
        "language_override" : "language",
        "textIndexVersion" : 3
    }
]
>

>db.posts.dropIndex("post_text_text")
{ "nIndexesWas" : 2, "ok" : 1 }