reindex-portlet.browser-console.js

var portletId = '15';

var authToken = Liferay.authToken;

var url = '/en_US/group/control_panel/manage?p_auth=' + authToken + '&p_p_id=137&p_p_lifecycle=1&p_p_state=maximized&p_p_mode=view&refererPlid=565250&_137_struts_action=%2Fadmin_server%2Fedit_server';

var data = '_137_formDate=1472741233467&_137_cmd=reindex&_137_tabs1=server&_137_tabs2=&_137_tabs3=&_137_redirect=&_137_portletId=' + portletId + '&_137_tabs2TabsScroll='

var httpRequest = new XMLHttpRequest()
httpRequest.open('POST', url, true);
httpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
httpRequest.send(data);