I want to upgrade my Elasticsearch from version 5.6 to version 7.8. I have around 900 GB of data. The core application is utilising the Elasticsearch and hence I would like to complete this with a limited downtime period. Snapshot and restore is one option which I have found. Any suggestions or inputs which I am unaware will be useful.
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Hi, Do you have any extra node to be able to transfer data to it first and then transfer them back? – Saeed Nasehi Oct 28 '20 at 06:24
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I can create a spare node – K M Oct 29 '20 at 05:55
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Elasticsearch versions can communicates from 1 major version to another. So to migrate with 0 downtime, you can connect a 6.8 node to your 5.6 cluster.
- If indices are compatible, use Shard allocation awareness to move shard to new cluster.
- If not, reindex (with shard allocation awarness to ensure that one primary or one replica is on your new nodes)
- Then kill 5.6 nodes one by one.
And redo this steps a second time between 6.8 and 7.9 nodes
Jaycreation
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Can you please share any notes or blog posts which describe this process in detail? – K M Oct 30 '20 at 05:13
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you can follow the rolling upgrades documentation of elastic https://www.elastic.co/guide/en/elasticsearch/reference/current/rolling-upgrades.html – Jaycreation Oct 30 '20 at 07:06