Once the new extra plugin with extra-analysis-khmer is available on Maven Central, we need to deploy it to the Elasticsearch cluster and restart the machines with it enabled, so we can reindex the Khmer-language wikis (see subtask).
(This is important but not urgent, so if it makes sense to wait a bit and bundle it with other tasks that require restarting the cluster, that'd be fine.)
- All elastic* hosts have been rolling upgraded from wmf-elasticsearch-search-plugins/stretch-wikimedia 6.5.4-4~stretch to wmf-elasticsearch-search-plugins/stretch-wikimedia 6.5.4-6~stretch
- relforge
- codfw
- eqiad