Save.php

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

use Magento\Framework\App\Action\Context;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Search\Model\QueryFactory;
use Magento\Framework\Controller\Result\JsonFactory;
use Magento\CatalogSearch\Helper\Data as HelperData;
use Magento\Framework\Controller\Result\Json;

class Save extends \Magento\Framework\App\Action\Action
{
    private $storeManager;

    private $catalogSearchHelper;

    private $queryFactory;

    private $resultJsonFactory;

    public function __construct(
        Context $context,
        HelperData $catalogSearchHelper,
        StoreManagerInterface $storeManager,
        QueryFactory $queryFactory,
        JsonFactory $resultJsonFactory
    ) {
        parent::__construct($context);
        $this->storeManager = $storeManager;
        $this->catalogSearchHelper = $catalogSearchHelper;
        $this->queryFactory = $queryFactory;
        $this->resultJsonFactory = $resultJsonFactory;
    }

    public function execute()
    {
        /* @var $query \Magento\Search\Model\Query */
        $query = $this->queryFactory->get();

        $query->setStoreId($this->storeManager->getStore()->getId());

        if ($query->getQueryText() != '') {
            try {
                if ($this->catalogSearchHelper->isMinQueryLength()) {
                    $query->setId(0)->setIsActive(1)->setIsProcessed(1);
                } else {
                    $query->saveIncrementalPopularity();
                }
                $responseContent = ['success' => true, 'error_message' => ''];
            } catch (\Magento\Framework\Exception\LocalizedException $e) {
                $responseContent = ['success' => false, 'error_message' => $e];
            }
        } else {
            $responseContent = ['success' => false, 'error_message' => __('Search term is empty')];
        }

        $resultJson = $this->resultJsonFactory->create();
        return $resultJson->setData($responseContent);
    }
}