docs: public Observable<Images> imageSearchAsync(long customConfig, String query, ImageSearchOptionalParameter imageSearchOptionalParameter) {
          return imageSearchWithServiceResponseAsync(customConfig, query, imageSearchOptionalParameter).map(new Func1<ServiceResponse<Images>, Images>() {
              @Override
              public Images call(ServiceResponse<Images> response) {
                  return response.body();
              }
          });
      }