By default http transport and internal elasticsearch transport only listens to localhost. If you want to access Elasticsearch from the host other than localhost then try adding following configurations in config/elasticsearch.yml. Also, 9200 port should be opened.
transport.host: localhost
transport.tcp.port: 9300
http.port: 9200
network.host: 0.0.0.0
Here, network.host as 0.0.0.0 allow access from any host within the network.
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