/usr/share/lua/5.2/systemd/journal.lua is in lua-systemd 0~git20160517-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/lua/5.2/systemd/../../5.1/systemd/journal.lua
/usr/share/lua/5.2/systemd/../../5.1/systemd/journal.lua