https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html#store-dag-code

![Captura de pantalla 2021-05-26 a las 17 47 56](https://user-images.githubusercontent.com/11339132/119691160-a2049a00-be4a-11eb-8f55-0ad2c6117620.png)

The Default is True or None?
tests/core/test_configuration.py
conf.deprecated_options = {
            ('logging', 'logging_level'): ('core', 'logging_level', '2.0.0'),
        }
        
        conf.remove_option('core', 'logging_level')
        conf.remove_option('logging', 'logging_level')
        with pytest.warns(DeprecationWarning):
            with mock.patch.dict('os.environ', AIRFLOW__CORE__LOGGING_LEVEL="VALUE"):
                assert conf.get('logging', 'logging_level') == "VALUE"
        with pytest.warns(DeprecationWarning), conf_vars({('core', 'logging_level'): 'VALUE'}):
            assert conf.get('logging', 'logging_level') == "VALUE"
    @conf_vars(
        {
            ("celery", "result_backend"): None,
            ("celery", "celery_result_backend"): None,
            ("celery", "celery_result_backend_cmd"): None,
        }
    )
    def test_deprecated_options_cmd(self):