This file is indexed.

/etc/apparmor.d/tunables/sys 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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#    Copyright (C) 2012 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.
#
# ------------------------------------------------------------------

# @{sys} is the location where sysfs is mounted.
@{sys}=/sys/