code: public JenkinsServer restart(Boolean crumbFlag) throws IOException {
  		try {
  			client.post("/restart", crumbFlag);
  		} catch (org.apache.http.client.ClientProtocolException e) {
  			LOGGER.error("restart()", e);
  		}
          return this;
  	}
docs: Restart Jenkins without waiting for any existing build to complete
  
  @param crumbFlag
  <code>true</code> to add <b>crumbIssuer</b> <code>false</code>
  otherwise.
  @throws IOException
  in case of an error.