@query_params('allow_no_indices', 'expand_wildcards', 'ignore_unavailable',
        'local')
    def exists_alias(self, index=None, name=None, params=None):
        return self.transport.perform_request('HEAD', _make_path(index, '_alias',
                name), params=params)
Return a boolean indicating whether given alias exists.
dataset/ETHPy150Open elastic/elasticsearch-py/elasticsearch/client/indices.py/IndicesClient.exists_alias