magento-test/app/code/Magento/Bundle/etc/webapi_soap/di.xml

<?xml version="1.0"?>
<!--
/**
 * 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:ObjectManager/etc/config.xsd">
    <type name="Magento\Catalog\Helper\Product\ConfigurationPool">
        <arguments>
            <argument name="instancesByType" xsi:type="array">
                <item name="bundle" xsi:type="object">Magento\Bundle\Helper\Catalog\Product\Configuration</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Bundle\Api\ProductLinkManagementInterface">
        <plugin name="reindex_after_add_child_by_sku" type="Magento\Bundle\Plugin\Api\ProductLinkManagement\ReindexAfterAddChildBySkuPlugin"/>
        <plugin name="reindex_after_remove_child" type="Magento\Bundle\Plugin\Api\ProductLinkManagement\ReindexAfterRemoveChildPlugin"/>
    </type>
</config>