Disable output on createIndex

I followed your tutorial here http://tnt.studio/blog/did-you-mean-functionality-with-laravel-scout where you explain how to create trigrams.
If the function `createIndex` is called there is no way to disable the ouput of the `TNTINdexer`.
This is suboptimal if you have an api whereof you can create posts or sth. else and run the trigram generator directly after the creation process.

src/TNTSearch.php

@@ -60,13 +60,15 @@ public function setTokenizer(TokenizerInterface $tokenizer)
 
     /**
      * @param string $indexName
+     * @param boolean $disableOutput
      *
      * @return TNTIndexer
      */
-    public function createIndex($indexName)
+    public function createIndex($indexName, $disableOutput = false)
     {
         $indexer = new TNTIndexer;
         $indexer->loadConfig($this->config);
+        $indexer->disableOutput = $disableOutput;
 
         if ($this->dbh) {
             $indexer->setDatabaseHandle($this->dbh);