def METHOD_NAME(self, index, params=None):
    """
    `<http://www.elastic.co/guide/en/elasticsearch/reference/current>`_
    :arg index: The name of the follower index that should be turned into a
        regular index.
    """
    if index in SKIP_IN_PATH:
        raise ValueError("Empty value passed for a required argument 'index'.")
    return self.transport.perform_request(
        "POST", _make_path(index, "_ccr", "unfollow"), params=params
    )