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Adds info about reindexing and restarting the cluster
|+ Version Dependencies
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! MediaWiki !! ElasticSearch !! Elastica !! CirrusSearch!! Cluster Restart? !! Reindex?
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| REL1_27 || 1.x || REL1_27 || REL1_27|| n/a || n/a
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| REL1_28 || 2.x || REL1_28 || REL1_28|| restart || yes <ref>For more information about upgrading from 1.x to 2.4, see [https://www.elastic.co/guide/en/elasticsearch/reference/2.4/setup-upgrade.html Upgrading Elasticsearch] in the Elasticsearch 2.4 Reference.</ref>
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| REL1_29 || 5.3+ || REL1_29 || REL1_29|| restart || yes <ref>For more information about upgrading from 2.4 to 5.6, see [https://www.elastic.co/guide/en/elasticsearch/reference/5.6/setup-upgrade.html Upgrading Elasticsearch] in the Elasticsearch 5.6 Reference.</ref>|-| REL1_30 || 6.x || REL1_30 || REL1_30 || no <ref>Elasticsearch 6.x support rolling upgrades from Elasticsearch 5.6 Upgrading from earlier versions requires a full cluster restart. See https://www.elastic.co/guide/en/elasticsearch/reference/6.0/restart-upgrade.html</ref> || Depends <ref>Elasticsearch can read indices created in the '''previous major version'''. Older indices must be reindexed or deleted. Elasticsearch will fail to start if incompatible indices are present.</ref>
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With version 6.0 of ElasticSearch being already released, we should immediately upgrade MediaWiki to REL1_29 which is compatible with ElasticSearch 6.x. In the new ElasticSearchtable above es6.x is listed as compatible with mwREL1_30, but in reality we can use es6.x starting in mwREL1_29.
Elastic Co. provides an [https://github.com/elastic/ansible-elasticsearch/tree/master ansible role to manage your installation] (including a [https://github.com/elastic/ansible-elasticsearch/tree/2.x 2.x branch] for older setups). Their [https://www.elastic.co/guide/en/elasticsearch/reference/6.0/setup-upgrade.html guide to upgrading] covers the nitty gritty.
