This file is indexed.

/usr/share/vim/vim80/indent/systemd.vim is in vim-runtime 2:8.0.1453-1ubuntu1.

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

The actual contents of the file can be viewed below.

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" 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