setup the initial master mode:
https://towardsdev.com/elasticsearch-8-express-installation-guide-6065d89141d8
for other node, need to copy the certificate from the master node. otherwise they cannot join the cluster.
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There are http.ssl and transportation.ssl
http.ssl is for client(kibana, logstash, or your custome code) to connect to elastic. Ports 9200
transportation.ssl is for the node in the cluster to communicate among themself . Ports 9300.
Elastic suggest to use different ca and certs for http
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