System.xml snippet to inform user of values set in env.php

system.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="catalog">
            <group id="search">
                <!-- add messaging for fields which are set in env.php -->
                <field id="elasticsearch_server_hostname" translate="label comment" canRestore="1">
                    <comment>
                        This field is configured by the server environment. Any changes will not take effect.
                    </comment>
                </field>
                <field id="elasticsearch_server_port" translate="label comment" canRestore="1">
                    <comment>
                        This field is configured by the server environment. Any changes will not take effect.
                    </comment>
                </field>
            </group>
        </section>
    </system>
</config>