Product.php

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<?php
namespace Magento\Bundle\Model\Plugin;

use Magento\Bundle\Model\Product\Type;
use Magento\Catalog\Model\Product as CatalogProduct;

class Product
{
    private $type;

    public function __construct(Type $type)
    {
        $this->type = $type;
    }

    public function afterGetIdentities(
        CatalogProduct $product,
        array $identities
    ) {
        foreach ($this->type->getParentIdsByChild($product->getEntityId()) as $parentId) {
            $identities[] = CatalogProduct::CACHE_TAG . '_' . $parentId;
        }
        return $identities;
    }
}