docs: public Observable<ClosedListEntityExtractor> getClosedListAsync(UUID appId, String versionId, UUID clEntityId) {
          return getClosedListWithServiceResponseAsync(appId, versionId, clEntityId).map(new Func1<ServiceResponse<ClosedListEntityExtractor>, ClosedListEntityExtractor>() {
              @Override
              public ClosedListEntityExtractor call(ServiceResponse<ClosedListEntityExtractor> response) {
                  return response.body();
              }
          });
      }