Plugin for Child products stock status change

di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <type name="Magento\CatalogInventory\Api\StockRegistryInterface">
        <plugin name="Custom_Erp::addStockProductsInQueue"
                type="Custom\Es\Plugin\StockUpdatePlugin"/>
    </type>
</config>

StockUpdatePlugin.php

<?php

namespace Custom\Es\Plugin;

use Klevu\Search\Model\Product\MagentoProductActionsInterface;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\CatalogInventory\Api\StockRegistryInterface;
use Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable;
use Magento\Store\Model\StoreManagerInterface;

class StockUpdatePlugin
{
    /**
     * @var StoreManagerInterface
     */
    private $storeManager;

    /**
     * @var ProductRepositoryInterface
     */
    private $productRepository;

    /**
     * @var MagentoProductActionsInterface
     */
    private $magentoProductActions;
    /**
     * @var Configurable
     */
    private $catalogProductTypeConfigurable;

    /**
     * StockUpdatePlugin constructor.
     *
     * @param StoreManagerInterface $storeManager
     * @param ProductRepositoryInterface $productRepository
     * @param MagentoProductActionsInterface $magentoProductActions
     * @param Configurable $catalogProductTypeConfigurable
     */
    public function __construct(
        StoreManagerInterface $storeManager,
        ProductRepositoryInterface $productRepository,
        MagentoProductActionsInterface $magentoProductActions,
        Configurable $catalogProductTypeConfigurable
    ) {
        $this->storeManager = $storeManager;
        $this->productRepository = $productRepository;
        $this->magentoProductActions = $magentoProductActions;
        $this->catalogProductTypeConfigurable = $catalogProductTypeConfigurable;
    }

    /**
     * @param StockRegistryInterface $subject
     * @param $result
     *
     * @return mixed
     */
    public function afterUpdateStockItemBySku(
        StockRegistryInterface $subject,
        $result,
        string $productSku,
        $stockItem,
    ) {
        try {
            $storeId = (int)$this->storeManager->getStore()->getId();
            $product = $this->productRepository->get($productSku);

            if ($product instanceof \Magento\Catalog\Api\Data\ProductInterface) {
                $parentId = $this->getParentIdByChild($product->getId());
                if (!$parentId) {
                    return $result;
                }
                $this->magentoProductActions->markRecordIntoQueue([$parentId], 'products', $storeId);
            }
        } catch (\Magento\Framework\Exception\NoSuchEntityException $e) {
            return $result;
        }

        return $result;
    }

    private function getParentIdByChild(int $childId)
    {
        $parentId = null;
        $parentIds = $this->catalogProductTypeConfigurable->getParentIdsByChild($childId);
        if (!$parentIds) {
            return null;
        }
        if (is_array($parentIds) && isset($parentIds[0])) {
            $parentId = $parentIds[0];
        }

        return $parentId;
    }
}