public static function get_searched_query_data($filter_name = null, $successful = true)
 {
     if ($successful) {
         $where_condition = 'hits > 0';
     } else {
         $where_condition = 'hits = 0';
     }
     if (!is_null($filter_name)) {
         $where_condition .= ' AND ';
         $where_condition .= self::get_between_date_condition_by_filter_name($filter_name);
     }
     return ES_List_User_Searches_Database::get_data($where_condition);
 }