/usr/share/nvim/runtime/indent/systemd.vim is in neovim-runtime 0.2.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | " Vim indent file
" Language: systemd.unit(5)
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
" Looks a lot like dosini files.
runtime! indent/dosini.vim
|