To be clear, we still don't collect or share personal
information and auto-suggest does not impact that at all.
I appreciate it may make you and others uncomfortable
and we're sensitive to that, but it is not a change in
terms of privacy. We simply do not associate queries with
personal information (e.g. IP addresses) and in fact
don't store any of it at all.
https://news.ycombinator.com/item?id=7700960