We need to setup a elastic search cluster for phabricator urgently as it seems mysql full text search query's are causing it to crash.
We could possibly create a new host for phabricator to use elastic search. Which we could maintain if releng agrees.
But as our install grows and grows we are going to have more problems like T156905
@mmodell has been working on elastic search very hard. There are still more improvements to be done. But it's better to have phabricator up and running instead of down because it crashed it's own db due to searching.