search_score.js

function getQuery (searchString, callback) {

    mongo.MongoClient.connect(
        uri, 
        function(err, db) {
            if(err) throw err;

            query = { "$text": { "$search": searchString.toString() } };

            var cursor = db.collection("quotes").find(
                query,  
                { 'score': { '$meta': 'textScore' } },
                { '$sort': { '$meta': 'textScore' } }
                ).limit(3);

            cursor.toArray(
                function(error, docs){
                    if (docs.length === 0) { 
                        callback(false); 
                    } else { 
                        callback(docs); 
                    } } );
        });
}