docs: public Observable<Void> updateFaceAsync(String personGroupId, UUID personId, UUID persistedFaceId, UpdateFaceOptionalParameter updateFaceOptionalParameter) {
          return updateFaceWithServiceResponseAsync(personGroupId, personId, persistedFaceId, updateFaceOptionalParameter).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }