无法通过更新标志更新数据流作业

I am trying to update DataFlow job by setting setUpdate flag in DataflowPipelineOptions to true. I have a function which checks for existing job with a name, and if the job is not there, I set setUpdate flag to false, otherwise true. This means for deploying the job for the first time, setUpdate flag is set to false, and all subsequent deployment will set flag to true. I am trying to update DataFlow job by setting s