Python SDK: Possible mismatch between Admin class __init__ and Cluster class _authenticate

    def _authenticate(self,

                      authenticator=None,  # type: CoreAuthenticator

                      username=None,  # type: str

                      password=None  # type: str

                      ):

        self._cluster.authenticate(authenticator, username, password)

        credentials = authenticator.get_credentials()

        self._clusteropts = credentials.get('options', {})

        self._clusteropts['bucket'] = "default"

        self._clusterclient=None

        auth=credentials.get('options')

        self.admin = Admin(auth.get('username'), auth.get('password'), connstr=str(self.connstr))

        connection_string = kwargs.pop('connection_string', None)

        bucket = kwargs.pop('bucket', 'default')

        if not connection_string:

            connection_string = "http://{0}:{1}".format(host, port)

            connection_string += "/{0}".format(bucket)

            connection_string += "?ipv6=" + kwargs.pop('ipv6', 'disabled')