WIP plan please fix:
- [x] Install & test elasticsearch 5.6.14 to deployment-prep
- [] T215931 Upgrade codfw to 5.6.14 (rolling restart)
- [] T215931 Upgrade eqiad to 5.6.14 (should we switch traffic to codfw?)
- [] T216052: Upgrade logstash to 5.6.14 (so that we assure compatibility and api-feature-usage can still be populated once the search cluster is running 6.5)
- [] In parallel merge the es6 branch for Elastica and CirrusSearch to master and wait for the train to be stable enough when we are sure it can't be rolled back.
- [] T199791 release plugins for 6.5.4
- [] Install & test elasticsearch 6.5.4 to deployment-prep
- [] Upgrade codfw to 6.5.4 (rolling restart)
- [] Switch search related traffic to codfw
- [] Upgrade eqiad to 6.5.4 (rolling restart)
- [] Switch search related traffic back to eqiad