需求：
kibana監控elasticsearch+kibana+logstash的性能尋找，性能瓶頸！
發現啟動logstash加載logstash.yml，不讀取配置好的xpack.monitoring.elasticsearch.url: "xxx"的值，而讀取的系統默認的"http://localhost:9200"實例進行健康監測！，搞得懵逼了！，搞了好幾天最后發現問題了，yaml語言的語法，開啟的選項必須對齊。
簡單的elk架構
錯誤日志：
[ERROR][logstash.licensechecker.licensemanager] Unable to retrieve license information from license server {:message=>"Elasticsearch Unreachable: [http://localhost:9200/][Manticore::SocketException] Connection refused",
解決方案：
查看logstash.yml,對開啟的參數需要對齊，方才讀取參數的值！
[root@DZSWJ_NRGL config]# egrep -v "^#|^$" logstash.yml node.name: node-lg-xxx.xxx
pipeline.workers: 3 pipeline.batch.size: 256 pipeline.batch.delay: 3000 http.host: "xxx.xxx.xxxx.xxx" http.port: "9600" log.level: warn xpack.monitoring.elasticsearch.url: "http://xxx.xxx.xxx.xxx:9200" xpack.monitoring.elasticsearch.username: "logstash_system" xpack.monitoring.elasticsearch.password: "123123"
kibana展示圖
