docs: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Empty, ClusterOperationMetadata> deleteClusterAsync(
        String projectId, String region, String clusterName) {
  
      DeleteClusterRequest request =
          DeleteClusterRequest.newBuilder()
              .setProjectId(projectId)
              .setRegion(region)
              .setClusterName(clusterName)
              .build();
      return deleteClusterAsync(request);
    }