Logstash on one EC2 instance and ES & Kibana on another - how to provide creds in LS output?

I've split the Elastic Stack into 2 EC2 instances:
instance1 : 2Gig, 1CPU : Logstash
instance2 : 8Gig, 2CPUs : ElasticSearch & Kibana

I will be providing the public IP of instance2 in the logstash elasticsearch output plugin. Do I need to provide AWS key in there?
Also, do I need the key in Kibana? Or just providing the public IP will do?

I've set network.host to in elasticsearch (instance1), and set logstash output to public IP of instance1. But it says HostUnreachableError.

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