This file is indexed.

/usr/share/vim/vim80/doc/help.txt is in vim-tiny 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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*help.txt*	For Vim version 7.4.  Last change: 2016 Sep 07

		  VIM - fake help file for vim-tiny

The Vim online help is not installed on this Debian GNU/Linux system.

WHY ?

Because only the "vim-tiny" package is installed, whose sole purpose is to
provide the vi command for base installations.  As such, it contains a minimal
version of Vim compiled with no graphical user interface and a small subset of
features, in order to keep the package size small.

Since the "vim-runtime" package is rather huge when compared to "vim-tiny",
installing the latter does not automatically install the former.

HOW TO GET A BETTER VIM

To get a more featureful Vim binary (and a vim command, rather than just vi),
install one of the following packages: vim, vim-nox, vim-athena, vim-gtk, or
vim-gtk3.

HOW TO OBTAIN HELP

either browse the Vim online help via web starting at

     http://vimhelp.appspot.com/help.txt.html#help.txt

or ask your administrator to install the "vim-doc" package, which contains the
   HTML version of the online help and browse it starting at

     /usr/share/doc/vim/html/index.html

or  ask your administrator to install the "vim-runtime" package, re-run vi and
    access the online help again.  Note that all the above mentioned Vim
    variants other then "vim-tiny" automatically install the "vim-runtime"
    package.  If you don't suffer from disk space shortage using one of them is
    recommended.