code: public Observable<FeaturesResponseObject> listAsync(UUID appId, String versionId, ListFeaturesOptionalParameter listOptionalParameter) {
          return listWithServiceResponseAsync(appId, versionId, listOptionalParameter).map(new Func1<ServiceResponse<FeaturesResponseObject>, FeaturesResponseObject>() {
              @Override
              public FeaturesResponseObject call(ServiceResponse<FeaturesResponseObject> response) {
                  return response.body();
              }
          });
      }
docs: Gets all the extraction features for the specified application version.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param listOptionalParameter 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 FeaturesResponseObject object