/**
  * Check Captcha On Forgot Password Page
  *
  * @param \Magento\Framework\Event\Observer $observer
  * @return $this
  */
 public function execute(\Magento\Framework\Event\Observer $observer)
 {
     $captchaModel = $this->helper->getCaptcha(self::FORM_ID);
     if ($captchaModel->isRequired()) {
         /** @var \Magento\Framework\App\Action\Action $controller */
         $controller = $observer->getControllerAction();
         if (!$captchaModel->isCorrect($this->captchaStringResolver->resolve($controller->getRequest(), self::FORM_ID))) {
             $customerId = $this->customerSession->getCustomerId();
             $this->authentication->processAuthenticationFailure($customerId);
             if ($this->authentication->isLocked($customerId)) {
                 $this->customerSession->logout();
                 $this->customerSession->start();
                 $message = __('The account is locked. Please wait and try again or contact %1.', $this->scopeConfig->getValue('contact/email/recipient_email'));
                 $this->messageManager->addError($message);
             }
             $this->messageManager->addError(__('Incorrect CAPTCHA'));
             $this->actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
             $this->redirect->redirect($controller->getResponse(), '*/*/edit');
         }
     }
     $customer = $this->customerSession->getCustomer();
     $login = $customer->getEmail();
     $captchaModel->logAttempt($login);
     return $this;
 }