This file is indexed.

/usr/lib/tmpfiles.d/systemd-nologin.conf is in systemd 215-17+deb8u7.

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) and systemd-forbid-user-logins.service(5).
# This file has special suffix so it is not run by mistake.

F! /run/nologin 0644 - - - "System is booting up. See pam_nologin(8)"