'hlsearch' is very useful but at the same time too intrusive.

Help topic states specifically that :nohlsearch doesn't work in autocommand (actually it also doesn't work in timer callbacks) so there is no obvious way to make it auto turned off.

There is vim-cool plugin by @romainl and the essense of it might be the following snippet I am currently using:

# turn off hlsearch after:
# - doing nothing for 'updatetime'
# - getting into insert mode
augroup auto_nohlsearch | au!
    set updatetime=2000
    noremap <Plug>(nohlsearch) <cmd>nohlsearch<cr>
    noremap! <expr> <Plug>(nohlsearch) execute('nohlsearch')[-1]
    au CursorHold * call feedkeys("\<Plug>(nohlsearch)", 'm')
    au InsertEnter * call feedkeys("\<Plug>(nohlsearch)", 'm')
augroup END

Should we add this example, even though it is "hackish", to the help topic right after :h :nohlsearch or maybe even a simple plugin in the same way comment was added?