spotlight search doesn't work on iPhone 6 iOS 9.2.1
When swiping the home screen right, it displays Siri suggestions, nearby restaurants, etc., and news. However, when I type in a query I basically get no results. Once in a while some random suggested app from the Apple App Store will show up – I can't figure out why that particular app and not others that might also match. But I get no apps or contacts or notes that are on my iPhone, and no web search results, as well as no ability to send the query to a web search engine. It's been this way for months now, through a couple of updates to the iOS. I have tried turning off all spotlight options and turning them back on again, restarting, cursing. Nothing works.
iPhone 6, iOS 9.2.1, spotlight