magento-test/app/code/Magento/Bundle/etc/events.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:Event/etc/events.xsd">
    <event name="magento_bundle_api_data_optioninterface_save_before">
        <observer name="legacy_model_save" instance="Magento\Framework\EntityManager\Observer\BeforeEntitySave" />
    </event>
    <event name="magento_bundle_api_data_optioninterface_save_after">
        <observer name="legacy_model_save" instance="Magento\Framework\EntityManager\Observer\AfterEntitySave" />
    </event>
    <event name="magento_bundle_api_data_optioninterface_delete_after">
        <observer name="legacy_model_save" instance="Magento\Framework\EntityManager\Observer\AfterEntityDelete" />
    </event>
    <event name="magento_bundle_model_selection_save_after">
        <observer name="legacy_model_save" instance="Magento\Framework\EntityManager\Observer\AfterEntitySave" />
    </event>
    <event name="magento_bundle_model_selection_save_before">
        <observer name="legacy_model_save" instance="Magento\Framework\EntityManager\Observer\BeforeEntitySave" />
    </event>
</config>