docs: public Observable<PrebuiltEntityExtractor> getPrebuiltAsync(UUID appId, String versionId, UUID prebuiltId) {
          return getPrebuiltWithServiceResponseAsync(appId, versionId, prebuiltId).map(new Func1<ServiceResponse<PrebuiltEntityExtractor>, PrebuiltEntityExtractor>() {
              @Override
              public PrebuiltEntityExtractor call(ServiceResponse<PrebuiltEntityExtractor> response) {
                  return response.body();
              }
          });
      }