0
    $category = $this->categoryFactory->create()->load($categoryId);
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $collection = $objectManager->create('Magento\CatalogSearch\Model\ResourceModel\Fulltext\Collection');
    if ($category->getIsVirtualCategory()) {
        $queryFilter = $category->getVirtualRule()->getCategorySearchQuery($category);
        $collection->addQueryFilter($queryFilter);
    } else {
        $collection->addCategoryFilter($category);
    }

    echo "<pre>";
    print_r($collection->getData());

This piece of code is work in every where but i past this code on category save after event catalog_category_save_after it through exception

No such entity with id = 0 {"exception":"[object] (Magento\Framework\Exception\NoSuchEntityException(code: 0): No such entity with id = 0 at /var/www/html/vendor/magento/framework/Exception/NoSuchEntityException.php:50)"}

I don't understand why it through exception on observer.

I also try this code in plugin

<type name="Magento\Catalog\Model\Category">
    <plugin name="categoryaftersaveplugin" type="TM\WhiteListEmails\Model\CatgeoryAfterSave" />
</type>

But it not working.

I have also try to replace object manager with argument contructor

<type name="Vendor\ModuleName\Cron\GetVirtualCategory">
        <arguments>
        <argument name="collectionFactory" xsi:type="object">Magento\CatalogSearch\Model\ResourceModel\Fulltext\CollectionFactory</argument>
        </arguments>
    </type>

but the same result does not work In the observer any suggestions about this?

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