code: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Empty, ClusterOperationMetadata> deleteClusterAsync(
        DeleteClusterRequest request) {
      return deleteClusterOperationCallable().futureCall(request);
    }
docs: Deletes a cluster in a project.
  
  <p>Sample code:
  
  <pre><code>
  try (ClusterControllerClient clusterControllerClient = ClusterControllerClient.create()) {
  String projectId = "";
  String region = "";
  String clusterName = "";
  DeleteClusterRequest request = DeleteClusterRequest.newBuilder()
  .setProjectId(projectId)
  .setRegion(region)
  .setClusterName(clusterName)
  .build();
  clusterControllerClient.deleteClusterAsync(request).get();
  }
  </code></pre>
  
  @param request The request object containing all of the parameters for the API call.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails