UpdateItemsStockUponConfigChangeObserver.php

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<?php
namespace Magento\CatalogInventory\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;
use Magento\CatalogInventory\Model\Configuration;
use Magento\CatalogInventory\Model\ResourceModel\Stock\Item;

class UpdateItemsStockUponConfigChangeObserver implements ObserverInterface
{
    protected $resourceStockItem;

    public function __construct(Item $resourceStockItem)
    {
        $this->resourceStockItem = $resourceStockItem;
    }

    public function execute(EventObserver $observer)
    {
        $website = (int) $observer->getEvent()->getWebsite();
        $changedPaths = (array) $observer->getEvent()->getChangedPaths();

        if (\array_intersect([
            Configuration::XML_PATH_MANAGE_STOCK,
            Configuration::XML_PATH_MIN_QTY,
            Configuration::XML_PATH_BACKORDERS,
            Configuration::XML_PATH_NOTIFY_STOCK_QTY,
        ], $changedPaths)) {
            $this->resourceStockItem->updateSetOutOfStock($website);
            $this->resourceStockItem->updateSetInStock($website);
            $this->resourceStockItem->updateLowStockDate($website);
        }
    }
}