public function autoCompleteUserAction()
    {
        $field = $this->getEvent()->getRouteMatch()->getParam('field');
        $value = $this->getEvent()->getRouteMatch()->getParam('value');
        $request = $this->getRequest();
        $response = $this->getResponse();

        $result = $this->getUserService()->autoCompleteUser($field, $value);
        $response->setContent(\Zend\Json\Json::encode($result));

        return $response;
    }