docs: public Observable<ElasticPoolInner> createOrUpdateAsync(String resourceGroupName, String serverName, String elasticPoolName, ElasticPoolInner parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, serverName, elasticPoolName, parameters).map(new Func1<ServiceResponse<ElasticPoolInner>, ElasticPoolInner>() {
              @Override
              public ElasticPoolInner call(ServiceResponse<ElasticPoolInner> response) {
                  return response.body();
              }
          });
      }