It’s broader than a Neovim specific mapping, I’ve changed the system keyboard mapping of <Caps Lock> to <Esc> and <F9> to <Caps Lock>.
I think mapping <Caps Lock> to <Esc> isn’t uncommon for Neovim users. But I like having <Caps Lock> available for non Neovim purposes.
Just to clarify - means two taps of the esc key in succession will clear highlighting (ps I’m curious how other people do it!).
nmap <esc><esc> :noh<return>