This isn't a VE bug, here is the API response on beta labs:

http://en.wikipedia.beta.wmflabs.org/w/api.php?action=opensearch&search=Template%3ACite&suggest=

..with just one result

Here is the API response on live:

http://en.wikipedia.org/w/api.php?action=opensearch&search=Template%3ACite&suggest=

Could be search config issue on beta?

Belay that, this is in wmf9 and affects all users AFAICT.

This is a search related issue, https://gerrit.wikimedia.org/r/#/c/217150/ will be going out today to fix it.

Change 217150 had a related patch set uploaded (by Jforrester):
Enable wikimedia-extra plugin options for cirrus

https://gerrit.wikimedia.org/r/217150

Seems the issue was detected on Beta-Cluster-Infrastructure before rolling the train. I am wondering whether we could have detected it earlier or if it was a last minute change made just before the train deployment.

The breakage was caused by merging https://gerrit.wikimedia.org/r/#/c/208011/ which was merged ~3:30pm SF time the day before the train rolled forward. It's close enough to end of day (past end of day for parts of the search team) that it was perhaps too late to catch. The other half of this error was that vagrant was using a different configuration than prod for this wikimedia-extra elasticsearch plugin, meaning we didn't catch it in the review process. The above patch brings prod in-line with how we have been testing things.

Change 217150 merged by jenkins-bot:
Enable wikimedia-extra plugin options for cirrus

https://gerrit.wikimedia.org/r/217150

@EBernhardson thanks! That is a really useful feedback.

@Ryasmeen is this happening again in phase0, or is that a marker indicating what was previously verified?

In T101842#1370014, @EBernhardson wrote:

@Ryasmeen is this happening again in phase0, or is that a marker indicating what was previously verified?

That gave me a little heart attack. It doesn't seem to be happening in phase0. Probably just a tag that we caught it there.