This file is indexed.

/etc/apparmor.d/abstractions/dbus-session-strict is in apparmor 2.12-4ubuntu5.

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

The actual contents of the file can be viewed below.

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# vim:syntax=apparmor
# ------------------------------------------------------------------
#
#    Copyright (C) 2011-2013 Canonical Ltd.
#
#    This program is free software; you can redistribute it and/or
#    modify it under the terms of version 2 of the GNU General Public
#    License published by the Free Software Foundation.
#
# ------------------------------------------------------------------

  # unique per-machine identifier
  /etc/machine-id r,
  /var/lib/dbus/machine-id r,
  owner /run/user/*/bus rw,

  unix (connect, receive, send)
       type=stream
       peer=(addr="@/tmp/dbus-*"),

  # dbus with systemd and --enable-user-session
  owner /run/user/[0-9]*/bus rw,

  dbus send
       bus=session
       path=/org/freedesktop/DBus
       interface=org.freedesktop.DBus
       member={Hello,AddMatch,RemoveMatch,GetNameOwner,NameHasOwner,StartServiceByName}
       peer=(name=org.freedesktop.DBus),