InvalidatePriceIndexUponConfigChangeObserver.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogInventory\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer;
use Magento\CatalogInventory\Model\Configuration;
use Magento\Catalog\Model\Indexer\Product\Price\Processor;

class InvalidatePriceIndexUponConfigChangeObserver implements ObserverInterface
{
    private $priceIndexProcessor;

    public function __construct(Processor $priceIndexProcessor)
    {
        $this->priceIndexProcessor = $priceIndexProcessor;
    }

    public function execute(Observer $observer)
    {
        $changedPaths = (array) $observer->getEvent()->getChangedPaths();

        if (\in_array(Configuration::XML_PATH_SHOW_OUT_OF_STOCK, $changedPaths, true)) {
            $priceIndexer = $this->priceIndexProcessor->getIndexer();
            $priceIndexer->invalidate();
        }
    }
}