Hello,

After several months of hard work by the Discovery Search team, we're happy to announce that the CirrusSearch backend has been upgraded to ElasticSearch version 5. This update was bit tedious and difficult for the team; you can browse the various tickets in Phabricator if you'd like to know more.  

This upgrade to ES5 is great, because we now have a new Ukrainian analyzer to experiment with, a new reindexing API and soon, we’ll have an updated completion suggester - all of which makes our backend more standard and reduced a significant amount of technical debt.

Cheers from the Discovery Search Team!