docs: public Observable<List<AnnotationInner>> listAsync(String resourceGroupName, String resourceName, String start, String end) {
          return listWithServiceResponseAsync(resourceGroupName, resourceName, start, end).map(new Func1<ServiceResponse<List<AnnotationInner>>, List<AnnotationInner>>() {
              @Override
              public List<AnnotationInner> call(ServiceResponse<List<AnnotationInner>> response) {
                  return response.body();
              }
          });
      }