magento-test/app/code/Magento/Cms/etc/mview.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Mview/etc/mview.xsd">
    <view id="cms_page_grid" class="Magento\Catalog\Model\Indexer\Category\Flat" group="indexer">
        <subscriptions>
            <table name="cms_page" entity_column="page_id" />
        </subscriptions>
    </view>
</config>