SubtractQuoteInventoryObserver.php

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<?php
namespace Magento\CatalogInventory\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\CatalogInventory\Api\StockManagementInterface;
use Magento\Framework\Event\Observer as EventObserver;

class SubtractQuoteInventoryObserver implements ObserverInterface
{
    protected $stockManagement;

    protected $productQty;

    protected $itemsForReindex;

    public function __construct(
        StockManagementInterface $stockManagement,
        ProductQty $productQty,
        ItemsForReindex $itemsForReindex
    ) {
        $this->stockManagement = $stockManagement;
        $this->productQty = $productQty;
        $this->itemsForReindex = $itemsForReindex;
    }

    public function execute(EventObserver $observer)
    {
        $quote = $observer->getEvent()->getQuote();

        // Maybe we've already processed this quote in some event during order placement
        // e.g. call in event 'sales_model_service_quote_submit_before' and later in 'checkout_submit_all_after'
        if ($quote->getInventoryProcessed()) {
            return $this;
        }
        $items = $this->productQty->getProductQty($quote->getAllItems());

        $itemsForReindex = $this->stockManagement->registerProductsSale(
            $items,
            $quote->getStore()->getWebsiteId()
        );
        if (count($itemsForReindex)) {
            $this->itemsForReindex->setItems($itemsForReindex);
        }
        $quote->setInventoryProcessed(true);
        return $this;
    }
}