AddInventoryDataObserver.php

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<?php
namespace Magento\CatalogInventory\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer as EventObserver;

class AddInventoryDataObserver implements ObserverInterface
{
    protected $stockHelper;

    public function __construct(\Magento\CatalogInventory\Helper\Stock $stockHelper)
    {
        $this->stockHelper = $stockHelper;
    }

    public function execute(EventObserver $observer)
    {
        $product = $observer->getEvent()->getProduct();
        if ($product instanceof \Magento\Catalog\Model\Product) {
            $this->stockHelper->assignStatusToProduct($product);
        }
    }
}