code: def shutdown(self, hub=True, targets='all', block=False):
          
  
          logger.info("Attempting HighThroughputExecutor shutdown")
          # self.outgoing_q.close()
          # self.incoming_q.close()
          self.queue_proc.terminate()
          logger.info("Finished HighThroughputExecutor shutdown attempt")
          return True
docs: Shutdown the executor, including all workers and controllers.
  
          This is not implemented.
  
          Kwargs:
              - hub (Bool): Whether the hub should be shutdown, Default:True,
              - targets (list of ints| 'all'): List of block id's to kill, Default:'all'
              - block (Bool): To block for confirmations or not
  
          Raises:
               NotImplementedError