docs: public Observable<GenericResourceInner> getByIdAsync(String resourceId, String apiVersion) {
          return getByIdWithServiceResponseAsync(resourceId, apiVersion).map(new Func1<ServiceResponse<GenericResourceInner>, GenericResourceInner>() {
              @Override
              public GenericResourceInner call(ServiceResponse<GenericResourceInner> response) {
                  return response.body();
              }
          });
      }