Custom Search Query – include only custom fields and title

In my case I use a custom query so I can just use:

$query = new WP_Query(array('post_type' => 'akteur', 'meta_query' => array(
                                'relation' => 'OR',
                                array('key' => 'wpcf-kurzbeschreibung','compare' => 'LIKE','value' => $suchbegriff),
                                array('key' => 'wpcf-zusatzinfo','compare' => 'LIKE','value' => $suchbegriff)
                            )
                            ));