Create an index for text search in MongoDB

Let us create a collection with documents −

> db.demo331.insertOne({"Words":"This is a MySQL"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e521c35f8647eb59e562089")
}
> db.demo331.insertOne({"Words":"THIS is a MongoDB"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e521c36f8647eb59e56208a")
}

Display all documents from a collection with the help of find() method−

> db.demo331.find();

This will produce the following output −

{ "_id" : ObjectId("5e521c35f8647eb59e562089"), "Words" : "This is a MySQL" }
{ "_id" : ObjectId("5e521c36f8647eb59e56208a"), "Words" : "THIS is a MongoDB" }

Following is the query to create an index for text search −

> db.demo331.createIndex( {Words: "text" } );
{
   "createdCollectionAutomatically" : false,
   "numIndexesBefore" : 1,
   "numIndexesAfter" : 2,
   "ok" : 1
}
> db.demo331.find({$text:{$search:"MySQL"}});

This will produce the following output −

{ "_id" : ObjectId("5e521c35f8647eb59e562089"), "Words" : "This is a MySQL" }