Cluster node roles changed after rolling upgrade

Elastic Stack Elasticsearch
1

Hi!

We did a rolling upgrade from version 7.6.1 to 7.12.1 as documented in Rolling upgrades | Elasticsearch Guide [7.12] | Elastic. We have three nodes in our cluster. Before the upgrade each node had roles dilm, but afterwards they are all cdfhilmrstw:

curl 'http://localhost:9200/_cat/nodes?v&h=node.role,master,name&s=name'
node.role   master name
cdfhilmrstw -      es-dev-node0
cdfhilmrstw *      es-dev-node1
cdfhilmrstw -      es-dev-node2

Why did they change? And what are the implications?

Thanks!

2

From cat nodes API | Elasticsearch Guide [8.11] | Elastic;

Roles of the node. Returned values include c (cold node), d (data node), f (frozen node), h (hot node), i (ingest node), l (machine learning node), m (master-eligible node), r (remote cluster client node), s (content node), t (transform node), v (voting-only node), w (warm node), and - (coordinating node only).

There's no change as such, it's just further clarification and separation of the existing roles.

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