 It seems that --elasticsearch-version is not use.
@classmethod
    def setUpClass(cls):
        cls.es_url = aws_stack.get_local_service_url('elasticsearch')
        
        cls._create_domain()
        document = {
            'first_name': 'Jane',
            'last_name': 'Smith',
            'age': 32,
            'about': 'I like to collect rock albums',
            'interests': ['music']
        }
        resp = cls._add_document(TEST_DOC_ID, document)
        assert_equal(resp.status_code, 201,
            msg='Request failed({}): {}'.format(resp.status_code, resp.text))
    @classmethod
    def tearDownClass(cls):