docs: public Observable<List<BackupLongTermRetentionVaultInner>> listByServerAsync(String resourceGroupName, String serverName) {
          return listByServerWithServiceResponseAsync(resourceGroupName, serverName).map(new Func1<ServiceResponse<List<BackupLongTermRetentionVaultInner>>, List<BackupLongTermRetentionVaultInner>>() {
              @Override
              public List<BackupLongTermRetentionVaultInner> call(ServiceResponse<List<BackupLongTermRetentionVaultInner>> response) {
                  return response.body();
              }
          });
      }