def get(self, key: str, collection: str = DEFAULT_COLLECTION) -> Optional[dict]:
        """
        Get a value from the store.

        Args:
            key (str): key
            collection (str): collection name

        """
        response = self._container.read_item(key)
        if response is not None:
            messages = response.get("messages")
        else:
            messages = {}
        return messages

        Get a value from the store.

        Args:
            key (str): key
            collection (str): collection name

        
llama-index-integrations/storage/kvstore/llama-index-storage-kvstore-azurecosmosnosql/llama_index/storage/kvstore/azurecosmosnosql/base.py