getIndexName

string|null public
\Bitrix\Main\DB\MysqlCommonConnection::getIndexName(
 string $tableName,
 array $columns,
 boolean $strict = false
);

This non-static method returns name of an index.

Parameter	Description	Version
$tableName	Name of table.
$columns	Array of index columns.
$strict	The flag indicating that the columns in the index must exactly match the columns in the $arColumns parameter.