Migration of ELK from on prem 7.17 to 8.x in OCI

Elastic Stack Elasticsearch
1

We have different versions in our ELK stack .
Please suggest a plan for migration to 8.x . IAAS or SAAS ,which is recomended?

Server 1

elasticsearch-7.17.8-1.x86_64
elasticsearch-curator-5.7.6-1.x86_64
apm-server-6.6.2-1.x86_64
logstash-7.16.2-1.x86_64
kibana-7.17.8-1.x86_64

# Server 2

logstash-8.8.1-1.x86_64
apm-server-8.8.1-1.x86_64
elasticsearch-8.8.1-1.x86_64

# Server 3

apm-server-8.8.1-1.x86_64
kibana-8.8.1-1.x86_64
elasticsearch-8.8.1-1.x86_64
2

To upgrade in place, I'd follow the guide: Upgrade to Elastic 8.17.4 | Elastic Installation and Upgrade Guide [8.17] | Elastic

About the questions regarding IAAS or SAAS, I'd read The benefits of a managed Elasticsearch offering | Elastic which described where the responsibility is. I personally like a lot SAAS (Serverless as we name it) as it is always running the most advanced version without any operation to do on my side.

3

Thanks for your suggestion .I will check the documents and come back if having any doubt .Thanks again