**What it entails**
Deploying an elasticsearch server/cluster; deploying elasticsearch-related MW extensions; any other automation and/or services needed to make multiple wikis be able to talk to elasticsearch.
**Why needed**
Elasticsearch is a requirement for Wikibase 1.36 as case insensitive search is not possible without it after wb_terms. It also improves the advanced search capabilities of Wikibase, such as statement value matching etc.
**Impact**
- Can proceed with 1.36 upgrade of WBstack
- Improved search capability
**Stages**
- [x] Deploy an elastic search service to wbstack #wbstack-2021-elastic-mini-hike
- [x] Deploy inital code and configuration to connect mediawiki & WIkibase to elastic search #wbstack-2021-elastic-mini-hike
- [] Implement additional things
- Indexes need to be rebuilt when lexeme is enabled {T286780}
- [] Create new sites with elastic search {T286781}
- [] Convert existing sites to use elastic search