Please download and restore data from s3. Detailed instructions are at http://mongodb-enron-email.s3-website-us-east-1.amazonaws.com/ // add 4000000 copies of selected message var msg = db.messages.findOne({},{_id:0}) for(var i=0;i<4000000;i++){ db.messages.insert(msg); } // create text index db.messages.createIndex({body:"text"}) // once index build is successful db.messages.explain("executionStats").find({$text:{$search:"Unfortunately"}},{"body":1}).limit(2)