public com.google.longrunning.Operation updateWorkflow(
        com.google.cloud.workflows.v1beta.UpdateWorkflowRequest request) {
      return io.grpc.stub.ClientCalls.blockingUnaryCall(
          getChannel(), getUpdateWorkflowMethod(), getCallOptions(), request);
    }
<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