Steps to Reproduce:
Actual Results:
There are no suggestions.
Expected Results:
The page "Месечина (филм из 2016)" should have been suggested.
If you press Return after typing "Mesečina (film iz 2016)" in the search box, you will be presented with the page "Месечина (филм из 2016)".
The suggestions did work previously, so I'm guessing there was a recent change to the way search works that broke it.
More likely this is related to the elasticsearch 5 upgrade. The completion suggester had a big overhaul inside elasticsearch for v5, so we've also had to update the code our our side. Theres probably a bug in there somewhere with redirects, sill dig into it.
Verified with serbian wiki that it's not a redirects problem, as there is no page at Mesečina (film iz 2016). This looks to be something with auto-language conversions as suggested in T160919
Change 343673 had a related patch set uploaded (by EBernhardson):
[mediawiki/extensions/CirrusSearch] Don't pass null suggest queries to elasticsearch
Change 343673 merged by jenkins-bot:
[mediawiki/extensions/CirrusSearch] Don't pass null suggest queries to elasticsearch
Change 343744 had a related patch set uploaded (by EBernhardson):
[mediawiki/extensions/CirrusSearch] Don't pass null suggest queries to elasticsearch
Change 343744 merged by jenkins-bot:
[mediawiki/extensions/CirrusSearch] Don't pass null suggest queries to elasticsearch
Mentioned in SAL (#wikimedia-operations) [2017-03-20T23:58:40Z] <dereckson@tin> Synchronized php-1.29.0-wmf.16/extensions/CirrusSearch/includes/CompletionSuggester.php: Don't pass null suggest queries to elasticsearch (T160896) (duration: 00m 42s)