Index.php

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<?php
namespace Magento\CatalogSearch\Controller\Result;

use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Catalog\Model\Layer\Resolver;
use Magento\Catalog\Model\Session;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Action\HttpPostActionInterface;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Search\Model\QueryFactory;
use Magento\Search\Model\PopularSearchTerms;

class Index extends \Magento\Framework\App\Action\Action implements HttpGetActionInterface, HttpPostActionInterface
{
    protected $_catalogSession;

    protected $_storeManager;

    private $_queryFactory;

    private $layerResolver;

    public function __construct(
        Context $context,
        Session $catalogSession,
        StoreManagerInterface $storeManager,
        QueryFactory $queryFactory,
        Resolver $layerResolver
    ) {
        parent::__construct($context);
        $this->_storeManager = $storeManager;
        $this->_catalogSession = $catalogSession;
        $this->_queryFactory = $queryFactory;
        $this->layerResolver = $layerResolver;
    }

    public function execute()
    {
        $this->layerResolver->create(Resolver::CATALOG_LAYER_SEARCH);

        /* @var $query \Magento\Search\Model\Query */
        $query = $this->_queryFactory->get();

        $storeId = $this->_storeManager->getStore()->getId();
        $query->setStoreId($storeId);

        $queryText = $query->getQueryText();

        if ($queryText != '') {
            $catalogSearchHelper = $this->_objectManager->get(\Magento\CatalogSearch\Helper\Data::class);

            $getAdditionalRequestParameters = $this->getRequest()->getParams();
            unset($getAdditionalRequestParameters[QueryFactory::QUERY_VAR_NAME]);

            if (empty($getAdditionalRequestParameters) &&
                $this->_objectManager->get(PopularSearchTerms::class)->isCacheable($queryText, $storeId)
            ) {
                $this->getCacheableResult($catalogSearchHelper, $query);
            } else {
                $this->getNotCacheableResult($catalogSearchHelper, $query);
            }
        } else {
            $this->getResponse()->setRedirect($this->_redirect->getRedirectUrl());
        }
    }

    private function getCacheableResult($catalogSearchHelper, $query)
    {
        if (!$catalogSearchHelper->isMinQueryLength()) {
            $redirect = $query->getRedirect();
            if ($redirect && $this->_url->getCurrentUrl() !== $redirect) {
                $this->getResponse()->setRedirect($redirect);
                return;
            }
        }

        $catalogSearchHelper->checkNotes();

        $this->_view->loadLayout();
        $this->_view->renderLayout();
    }

    private function getNotCacheableResult($catalogSearchHelper, $query)
    {
        if ($catalogSearchHelper->isMinQueryLength()) {
            $query->setId(0)->setIsActive(1)->setIsProcessed(1);
        } else {
            $query->saveIncrementalPopularity();
            $redirect = $query->getRedirect();
            if ($redirect && $this->_url->getCurrentUrl() !== $redirect) {
                $this->getResponse()->setRedirect($redirect);
                return;
            }
        }

        $catalogSearchHelper->checkNotes();

        $this->_view->loadLayout();
        $this->getResponse()->setNoCacheHeaders();
        $this->_view->renderLayout();
    }
}