Fro memory: press the Meta/Windows key; write "privacy" on the dash; a window with privacy options appears; hit the Search tab, disable the checkbox.
It annoys me that it's there by default and non-technical users will not know how to do anything. There should be an option or warning on the dash itself.
Which build is that? I don't see it in build 10074. It existed in the pre-Cortana build from last fall, but as far as I can tell, it was completely removed when Cortana was added.
Perhaps it was re-added? Or I'm looking in the wrong spot?
It is easily disabled and is only a feature in Ubuntu's Unity desktop. If you use a different version of Ubuntu (GNOME, Mate, KDE, whatever else they offer now) it won't be an issue.
Considering how many people liked google's desktop search widget, and similar, I'm not sure I agree... not to mention that seeing repository matches that aren't installed (yet) can be useful too. Not that most of those features require integrated online searches... but I can see how someone, even most casual users would prefer it that way.
Hell, look at how many people type in website addresses into their search box.