code: public Observable<List<CompositeEntityExtractor>> listCompositeEntitiesAsync(UUID appId, String versionId, ListCompositeEntitiesOptionalParameter listCompositeEntitiesOptionalParameter) {
          return listCompositeEntitiesWithServiceResponseAsync(appId, versionId, listCompositeEntitiesOptionalParameter).map(new Func1<ServiceResponse<List<CompositeEntityExtractor>>, List<CompositeEntityExtractor>>() {
              @Override
              public List<CompositeEntityExtractor> call(ServiceResponse<List<CompositeEntityExtractor>> response) {
                  return response.body();
              }
          });
      }
docs: Gets information about the composite entity models.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param listCompositeEntitiesOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;CompositeEntityExtractor&gt; object