This file is indexed.

/usr/lib/tmpfiles.d/x11.conf is in systemd 229-4ubuntu4.

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

The actual contents of the file can be viewed below.

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#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

# See tmpfiles.d(5) for details

# Make sure these are created by default so that nobody else can
d /tmp/.X11-unix 1777 root root 10d
d /tmp/.ICE-unix 1777 root root 10d
d /tmp/.XIM-unix 1777 root root 10d
d /tmp/.font-unix 1777 root root 10d
d /tmp/.Test-unix 1777 root root 10d

# Unlink the X11 lock files
r! /tmp/.X[0-9]*-lock