docs: public Observable<Void> addAsync(String jobId, TaskAddParameter task, TaskAddOptions taskAddOptions) {
          return addWithServiceResponseAsync(jobId, task, taskAddOptions).map(new Func1<ServiceResponseWithHeaders<Void, TaskAddHeaders>, Void>() {
              @Override
              public Void call(ServiceResponseWithHeaders<Void, TaskAddHeaders> response) {
                  return response.body();
              }
          });
      }