Response:
object(stdClass)#8 (5) {
  ["name"]=>
  string(9) "localhost"
  ["cluster_name"]=>
  string(13) "elasticsearch"
  ["cluster_uuid"]=>
  string(22) "EY89JtxkSqSthFYqFvEc7g"
  ["version"]=>
  object(stdClass)#9 (9) {
    ["number"]=>
    string(5) "7.3.0"
    ["build_flavor"]=>
    string(7) "default"
    ["build_type"]=>
    string(3) "deb"
    ["build_hash"]=>
    string(7) "de777fa"
    ["build_date"]=>
    string(27) "2019-07-24T18:30:11.767338Z"
    ["build_snapshot"]=>
    bool(false)
    ["lucene_version"]=>
    string(5) "8.1.0"
    ["minimum_wire_compatibility_version"]=>
    string(5) "6.8.0"
    ["minimum_index_compatibility_version"]=>
    string(11) "6.0.0-beta1"
  }
  ["tagline"]=>
  string(20) "You Know, for Search"
}