code: function(highlights) {
          var objects;
          if (highlights && _.isString(highlights)) {
            objects = arguments;
          } else {
            objects = highlights;
          }
          this._highlights = objects;
          return this;
        }
docs: Sets the highlight fields. Such as
  <pre><code>
  query.highlights('title');
  //or pass an array.
  query.highlights(['title', 'content'])
  </code></pre>
  @param {String|String[]} highlights a list of fields.
  @return {AV.SearchQuery} Returns the query, so you can chain this call.