我有一个单节点麋鹿安装工作良好，直到我发现 kibana 无法连接到 elasticsearch .

systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2018-12-28 14:21:33 EET; 5min ago
     Docs: http://www.elastic.co
 Main PID: 1193 (java)
    Tasks: 87
   Memory: 3.0G
      CPU: 5min 39.675s
   CGroup: /system.slice/elasticsearch.service
           ├─1193 /usr/bin/java -Xms2g -Xmx2g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+AlwaysPreTouch -Xss1m -Djava.awt.headless=true -Dfile.encoding=
           └─1548 /usr/share/elasticsearch/modules/x-pack-ml/platform/linux-x86_64/bin/controller

但这里有一个要点例外；
由于某种奇怪的原因，在重新启动之后，节点似乎恢复了。
如何解释这种行为？