docs: public Observable<List<DatabaseInner>> listByClusterAsync(String resourceGroupName, String clusterName) {
          return listByClusterWithServiceResponseAsync(resourceGroupName, clusterName).map(new Func1<ServiceResponse<List<DatabaseInner>>, List<DatabaseInner>>() {
              @Override
              public List<DatabaseInner> call(ServiceResponse<List<DatabaseInner>> response) {
                  return response.body();
              }
          });
      }