There are (at least) 3 ways, just upgrade in place, which I believe is more common than new deployments or the CCR you mention.
Note to get to 9.x you need to upgrade via 8.19.x first, see here
You also need to check out the Upgrade Assistant in kibana, if you dont have a kibana instance please start one.
How and on what is your cluster installed? e.g. 3 VMs each running RHEL, 3 physical machines in my data centre running Windows, its part of a docker or k8s or …
btw, you’ve posted several times before, and welcome back!, including one thread where you had 8.7 on a 2-node cluster that you grew to 3 nodes for “HA”. If this is same cluster, you must have upgraded 8.7 –> 8.8? 8.8 –> 8.19.x is not intrinsically any different. 8.19.x –> 9.x is not either, IMO. In all cases it’s really just “follow the steps in documentation”.
It is not the same cluster, it is other one, maybe I will be more precise, I use bitnami ELK stack and I’d like to upgrade it and I don’t know how to do it. I try to find any info but … it is not easy.
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