CheckContactUsFormObserver.php

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<?php
namespace Magento\Captcha\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\Request\DataPersistorInterface;
use Magento\Framework\App\ObjectManager;

class CheckContactUsFormObserver implements ObserverInterface
{
    protected $_helper;

    protected $_actionFlag;

    protected $messageManager;

    protected $redirect;

    protected $captchaStringResolver;

    private $dataPersistor;

    public function __construct(
        \Magento\Captcha\Helper\Data $helper,
        \Magento\Framework\App\ActionFlag $actionFlag,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\Framework\App\Response\RedirectInterface $redirect,
        CaptchaStringResolver $captchaStringResolver
    ) {
        $this->_helper = $helper;
        $this->_actionFlag = $actionFlag;
        $this->messageManager = $messageManager;
        $this->redirect = $redirect;
        $this->captchaStringResolver = $captchaStringResolver;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $formId = 'contact_us';
        $captcha = $this->_helper->getCaptcha($formId);
        if ($captcha->isRequired()) {
            $controller = $observer->getControllerAction();
            if (!$captcha->isCorrect($this->captchaStringResolver->resolve($controller->getRequest(), $formId))) {
                $this->messageManager->addError(__('Incorrect CAPTCHA.'));
                $this->getDataPersistor()->set($formId, $controller->getRequest()->getPostValue());
                $this->_actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
                $this->redirect->redirect($controller->getResponse(), 'contact/index/index');
            }
        }
    }

    private function getDataPersistor()
    {
        if ($this->dataPersistor === null) {
            $this->dataPersistor = ObjectManager::getInstance()
                ->get(DataPersistorInterface::class);
        }

        return $this->dataPersistor;
    }
}