Happy Wednesday!
I'm taking search offline sometime today to upgrade the server to a new instance type. It should be down for a day or so -- sorry for the inconvenience. If you're curious, the existing search machine is over 10 years old and was starting to accumulate a decade of cruft...!
Also, apparently these older machines cost more than twice what the newer ones cost, on top of being slower. Trying to save a bit of maintenance and cost, and hopefully a Wednesday is okay!
Edited: The other cool thing is that this also means that the search index will be effectively realtime afterwards... no more waiting a few minutes for the indexer to catch new content.