indexer_rollback.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

/** @var $objectManager \Magento\Framework\ObjectManagerInterface */
$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();

/** @var \Magento\Framework\Registry $registry */
$registry = $objectManager->get(\Magento\Framework\Registry::class);
$registry->unregister('isSecureArea');
$registry->register('isSecureArea', true);

/** @var \Magento\Catalog\Model\ResourceModel\Product\Collection $collection */
$collection = $objectManager->create(\Magento\Catalog\Model\ResourceModel\Product\Collection::class);
$collection->addAttributeToSelect('id')->load();
if ($collection->count() > 0) {
    $collection->delete();
}

/** @var \Magento\Store\Model\Store $store */
$store = $objectManager->create(\Magento\Store\Model\Store::class);
$storeCode = 'secondary';
$store->load($storeCode);
if ($store->getId()) {
    $store->delete();
}

$registry->unregister('isSecureArea');
$registry->register('isSecureArea', false);