docs: public Observable<AppServiceCertificateOrderInner> getByResourceGroupAsync(String resourceGroupName, String certificateOrderName) {
          return getByResourceGroupWithServiceResponseAsync(resourceGroupName, certificateOrderName).map(new Func1<ServiceResponse<AppServiceCertificateOrderInner>, AppServiceCertificateOrderInner>() {
              @Override
              public AppServiceCertificateOrderInner call(ServiceResponse<AppServiceCertificateOrderInner> response) {
                  return response.body();
              }
          });
      }