code: public static void unregisterApplicationNodeInCollectServer() throws IOException {
  		if (unregisterApplicationNodeInCollectServerUrl != null) {
  			new LabradorRetriever(unregisterApplicationNodeInCollectServerUrl).post(null);
  			LOG.info("application node removed from the collect server");
  		}
  	}
docs: Call the optional collect server to unregister this application's node.
  @throws IOException e