Hi, At the moment of ElasticSearch installation you specified Network host (see screenshoot below). This is value to be used in Host name field.

And, if you can't recall what was specified in Network host field, open elasticsearch.yml under config and find this value there!

for version 7.16.2 I had to change in elasticsearch.yml file, parameters:

network.host: 192.168.0.123
http.port: 9200
discovery.seed_hosts: ["192.168.0.123"]