docs: public Observable<CheckNameResultInner> checkNameAvailabilityAsync(String resourceGroupName, String clusterName, String name) {
          return checkNameAvailabilityWithServiceResponseAsync(resourceGroupName, clusterName, name).map(new Func1<ServiceResponse<CheckNameResultInner>, CheckNameResultInner>() {
              @Override
              public CheckNameResultInner call(ServiceResponse<CheckNameResultInner> response) {
                  return response.body();
              }
          });
      }