def METHOD_NAME(cls, document_id):
    """
    Check if a document ID exists.
    :param document_id: Document ID
    :type document_id: str
    :return: True if exists, False otherwise.
    :rtype: bool
    """
    with cls._rdb_context():
        return bool(
            r.table(cls._rdb_table).get(document_id).run(cls._rdb_connection)
        )