This file is indexed.

/etc/dbus-1/system.d/org.freedesktop.hostname1.conf is in ubuntu-system-service 0.2.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0"?> <!--*-nxml-*-->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">

<!--
  This file was taken from systemd.

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.
-->

<busconfig>

        <policy user="root">
                <allow own="org.freedesktop.hostname1"/>
                <allow send_destination="org.freedesktop.hostname1"/>
                <allow receive_sender="org.freedesktop.hostname1"/>
        </policy>

        <policy context="default">
                <allow send_destination="org.freedesktop.hostname1"/>
                <allow receive_sender="org.freedesktop.hostname1"/>
        </policy>

</busconfig>