docs: public Observable<List<EntityExtractor>> listEntitiesAsync(UUID appId, String versionId, ListEntitiesOptionalParameter listEntitiesOptionalParameter) {
          return listEntitiesWithServiceResponseAsync(appId, versionId, listEntitiesOptionalParameter).map(new Func1<ServiceResponse<List<EntityExtractor>>, List<EntityExtractor>>() {
              @Override
              public List<EntityExtractor> call(ServiceResponse<List<EntityExtractor>> response) {
                  return response.body();
              }
          });
      }