docs: public Observable<Void> reactivateAsync(String jobId, String taskId) {
          return reactivateWithServiceResponseAsync(jobId, taskId).map(new Func1<ServiceResponseWithHeaders<Void, TaskReactivateHeaders>, Void>() {
              @Override
              public Void call(ServiceResponseWithHeaders<Void, TaskReactivateHeaders> response) {
                  return response.body();
              }
          });
      }