A task to track patches of merge commits to activate elastic6 support code:
- Elastica: https://gerrit.wikimedia.org/r/492706
- mediawiki vendor: https://gerrit.wikimedia.org/r/492699
- CirrusSearch: https://gerrit.wikimedia.org/r/492709
These patches are inter-dependent and can only be deployed/undeployed using the train.