docs: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Instance, OperationMetadata> createInstanceAsync(
        LocationName parent, String instanceId, Instance instance) {
  
      CreateInstanceRequest request =
          CreateInstanceRequest.newBuilder()
              .setParent(parent == null ? null : parent.toString())
              .setInstanceId(instanceId)
              .setInstance(instance)
              .build();
      return createInstanceAsync(request);
    }