docs: public Observable<List<PrebuiltDomain>> listAvailableCustomPrebuiltDomainsAsync() {
          return listAvailableCustomPrebuiltDomainsWithServiceResponseAsync().map(new Func1<ServiceResponse<List<PrebuiltDomain>>, List<PrebuiltDomain>>() {
              @Override
              public List<PrebuiltDomain> call(ServiceResponse<List<PrebuiltDomain>> response) {
                  return response.body();
              }
          });
      }