MergePlugin.php

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<?php
namespace Magento\PageCache\Model\Layout;

use Magento\Framework\View\EntitySpecificHandlesList;

class MergePlugin
{
    private $entitySpecificHandlesList;

    public function __construct(
        EntitySpecificHandlesList $entitySpecificHandlesList
    ) {
        $this->entitySpecificHandlesList = $entitySpecificHandlesList;
    }

    public function beforeValidateUpdate(\Magento\Framework\View\Model\Layout\Merge $subject, $handle, $updateXml)
    {
        if (in_array($handle, $this->entitySpecificHandlesList->getHandles())
            && (strpos($updateXml, 'ttl=') !== false)
        ) {
            throw new \LogicException(
                "Handle '{$handle}' must not contain blocks with 'ttl' attribute specified. "
                . "Otherwise, these blocks will be treated as ESI by Varnish, however will not be shared between pages "
                . "because handle '{$handle}' is not generic. Such blocks will not be rendered on the page"
            );
        }
        return null;
    }
}