This file is indexed.

/usr/share/vim/addons/syntax/notmuch-compose.vim is in notmuch-vim 0.21-3ubuntu2.

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

The actual contents of the file can be viewed below.

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runtime! syntax/mail.vim

syntax region nmComposeHelp          contains=nmComposeHelpLine start='^Notmuch-Help:\%1l' end='^\(Notmuch-Help:\)\@!'
syntax match  nmComposeHelpLine      /Notmuch-Help:/ contained

highlight link nmComposeHelp        Include
highlight link nmComposeHelpLine    Error