Elasticsearch port 9200 or 9300?

Elastic Stack Elasticsearch
1

Can anyone explain which port number is elasticsearch listening?

When I am running elasticsearch and I can see

tcp6       0      0 :::9200                 :::*                    LISTEN      12390/java

tcp6       0      0 :::9300                 :::*                    LISTEN      12390/java

Also for discovery.zen.ping.unicast.hosts, is it 9300?

For ELB of eligible masters should add both listeners for 9200 and 9300?

2

9200 is for REST.
9300 for nodes communication...

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3

thanks for the reply.

so both of them should be open on the elasticsearch eligible master nodes?

4

At least 9300.

For 9200, it's up to you. It depends if you want to send REST requests to that node.

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6

For anyone visiting this topic, please see What are ports 9200 and 9300 used for?.