Answer by Johan Chane for Turning off auto indent when pasting text into vim

VimL:

inoremap <silent> <S-Insert> <Cmd>set paste<CR><C-r>+<Cmd>set nopaste<CR>

Neovim lua:

vim.keymap.set("i", "<S-Insert>", [[<Cmd>set paste<CR><C-r>+<Cmd>set nopaste<CR>]], { noremap = true, silent = true })