We have nginx/1.16.1. We need to upgrade to 1.21.0, 1.20.1. Can you pls share any article that describes the upgrade process. I'm a complete newbie to Elastic / Kibana. The tech who installed the server, left the job. I'm pouring over documents but don't seem to get a document. Anything would be helpfu. thanks.
Welcome to our community! 
We don't provide support for nginx here, only Kibana sorry.
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