This file is indexed.

/usr/share/vim/vim73/doc/help.txt is in vim-tiny 2:7.3.429-2ubuntu2.

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 7.3.  Last change: 2010 Aug 15

		  VIM - fake help file for vim-tiny

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

WHY ?

Because the "vim-runtime" package containing it is not installed.

This may happen if your administrator has chosen to install as only Vim variant
the "vim-tiny" package.  The "vim-tiny" package contains a minimal version of
Vim compiled with no graphical user interface and only a small subset of
features in order to keep small the package size.

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

HOW TO OBTAIN HELP

either browse the Vim online help via web starting at

     http://vimdoc.sourceforge.net/htmldoc/help.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 vim and
    access the online help again.  Note that all 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.