If I have 3 node cluster, do I need to get 3 separate node specific CA certificate or can I get one CA certificate and apply in all three servers? which one is the best practice..
Each node should have it's own specific certificate created by a single CA - which you can optionally also create.
You might want to read https://www.elastic.co/guide/en/elastic-stack-overview/7.3/encrypting-communications.html and the next pages describing the whole process of setting this up.
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