Monitor how much of the index is upgraded.

        Any additional keyword arguments will be passed to
        ``Elasticsearch.indices.get_upgrade`` unchanged.

def get_upgrade(self, using=None, **kwargs):
        """
        Monitor how much of the index is upgraded.

        Any additional keyword arguments will be passed to
        ``Elasticsearch.indices.get_upgrade`` unchanged.
        """
        return self._get_connection(using).indices.get_upgrade(index=self._name, **kwargs)