Search highlighted word

[abacha]

Is it possible to bind a shortcut (ie leader G) to do :Ag ?

[benoittgt]

I have this shortcut in my vimrc

nnoremap <leader>k :exe 'Ag!' expand('<cword>')<cr>

It searches the word under cursor. For highlighted word this is less easy

[zack]

This works for me:

vnoremap <leader>G "hy:Ag "<C-r>h"<CR>

I'm not sure if I'm missing something? The comment thread above implies a significant amount of difficulty that I'm just not seeing.