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