def exists_alias(self, using: Optional[UsingType] = None, **kwargs: Any) -> bool:
        """
        Return a boolean indicating whether given alias exists for this index.

        Any additional keyword arguments will be passed to
        ``Elasticsearch.indices.exists_alias`` unchanged.
        """
        return bool(
            self._get_connection(using).indices.exists_alias(index=self._name, **kwargs)
        )

        Return a boolean indicating whether given alias exists for this index.

        Any additional keyword arguments will be passed to
        ``Elasticsearch.indices.exists_alias`` unchanged.
        
elasticsearch/dsl/_sync/index.py