Wallmander\ElasticsearchIndexer\Model\Query\WpConverter::argAttachment PHP Method

    public static function argAttachment(Query $query, $value, &$q)
    {
        $q['attachment'] = sanitize_title_for_query(wp_basename($value));
        $q['name'] = $q['attachment'];
        $query->isSingle = true;
        $q['post_type'] = 'attachment';
    }