telnet is not allowed in our environment
here is the output of the curl
curl http://localhost:9200
{
"name" : "T4PB5b1",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "8b2cGZizQauJ1-87NmdIfA",
"version" : {
"number" : "6.2.3",
"build_hash" : "c59ff00",
"build_date" : "2018-03-13T10:06:29.741383Z",
"build_snapshot" : false,
"lucene_version" : "7.2.1",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}