There are some steps you can do to quiet your profile, without declaring retirement. You might be able to recreate your profile information from PDF, but I would imagine you don't want to have to recreate your network. (i.e. send invitations to them all on a new profile)
It's changed since I set it up--I remember there used to be a group of checkboxes about what you wanted: recruitment, getting in touch, etc. But here is a view of the current setting. So, for a start, turn that off. Is it just these professional headhunters you are concerned with, or also informal contacts through your network? I would imagine you could also change your headline to "on sabbatical," as a start.