code: private void updateComputeNodeUser(String poolId, String nodeId, String userName, NodeUpdateUserParameter nodeUpdateUserParameter, Iterable<BatchClientBehavior> additionalBehaviors) throws BatchErrorException, IOException {
          ComputeNodeUpdateUserOptions options = new ComputeNodeUpdateUserOptions();
          BehaviorManager bhMgr = new BehaviorManager(this.customBehaviors(), additionalBehaviors);
          bhMgr.applyRequestBehaviors(options);
  
          this.parentBatchClient.protocolLayer().computeNodes().updateUser(poolId, nodeId, userName, nodeUpdateUserParameter, options);
      }
docs: Updates the specified user account on the specified compute node.
  
  @param poolId The ID of the pool that contains the compute node.
  @param nodeId The ID of the compute node where the user account will be updated.
  @param userName The name of the user account to update.
  @param nodeUpdateUserParameter The set of changes to be made to the user account.
  @param additionalBehaviors A collection of {@link BatchClientBehavior} instances that are applied to the Batch service request.
  @throws BatchErrorException Exception thrown when an error response is received from the Batch service.
  @throws IOException Exception thrown when there is an error in serialization/deserialization of data sent to/received from the Batch service.