as i know support form 2.x to 5.x and 6.x
1.x to 5.x
https://www.elastic.co/guide/en/elasticsearch/reference/5.6/setup-upgrade.html
as i know support form 2.x to 5.x and 6.x
1.x to 5.x
https://www.elastic.co/guide/en/elasticsearch/reference/5.6/setup-upgrade.html
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