Elasticsearch upgrade from 6.8.0 to 7.9.2

Elastic Stack Elasticsearch
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Hi Team

We have around 60 nodes docker based production cluster running with version 6.8. We need to upgrade this to version 7.9.2.

We have used discovery settings such as discovery.zen.ping.unicast.hosts , discovery.zen.minimum_master_nodes in current configurations.

  • As from Elasticsearch version 7 and above, discovery.zen.* settings are ignored, so should we change these settings to discovery.seed_hosts and cluster.initial_master_nodes respectively ?

In one of the ElasticSearch Blog, it is mentioned that

If you perform a rolling upgrade then the cluster bootstrapping happens automatically, based on the number of nodes in the cluster and any existing minimum_master_nodes setting. This means it is important to ensure this setting is set correctly before starting the upgrade . There is no need to set initial_master_nodes here since cluster bootstrapping happens automatically when performing this rolling upgrade. The version 7 master-eligible nodes will prefer to vote for version 6.7 nodes in master elections, so you can normally expect a version 6.7 node to be the elected master during the upgrade until you have upgraded every one of the master-eligible nodes.

  • Does this suggest that we should not add cluster.initial_master_nodes setting ?
  • As the rolling upgrade suggested for upgrade from 6.8 to 7.9.2, what minimum configurations settings changes are essential ?

Any help is appreciated.

Regards

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Yes

Upgrade Elasticsearch | Elasticsearch Guide [7.9] | Elastic is the best place to start on this topic.

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