def _check_async_client(self) -> None:
        """
        Check if the async client is initialized.
        """
        if not self._acluster:
            raise ValueError("CouchbaseKVStore was not initialized with async client")

        Check if the async client is initialized.
        
llama-index-integrations/storage/kvstore/llama-index-storage-kvstore-couchbase/llama_index/storage/kvstore/couchbase/base.py