default void updateWorkflow(
        com.google.cloud.workflows.v1beta.UpdateWorkflowRequest request,
        io.grpc.stub.StreamObserver<com.google.longrunning.Operation> responseObserver) {
      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(
          getUpdateWorkflowMethod(), responseObserver);
    }
<pre>
Updates an existing workflow.
Running this method has no impact on already running executions of the
workflow. A new revision of the workflow may be created as a result of a
successful update operation. In that case, such revision will be used
in new workflow executions.
</pre>
java-workflows/grpc-google-cloud-workflows-v1beta/src/main/java/com/google/cloud/workflows/v1beta/WorkflowsGrpc.java