docs: public Observable<RegistryInner> beginUpdateAsync(String resourceGroupName, String registryName, RegistryUpdateParameters registryUpdateParameters) {
          return beginUpdateWithServiceResponseAsync(resourceGroupName, registryName, registryUpdateParameters).map(new Func1<ServiceResponse<RegistryInner>, RegistryInner>() {
              @Override
              public RegistryInner call(ServiceResponse<RegistryInner> response) {
                  return response.body();
              }
          });
      }