浏览器访问提示：Kibana server is not ready yet
查看日志如下
{"type":"log","@timestamp":"2019-12-04T10:26:39Z","tags":["warning","task_manager"],"pid":4631,"message":"PollError [security_exception] failed to authenticate user [elastic], with { header={ WWW-Authenticate="Basic realm=\"security\" charset=\"UTF-8\"" } }"}
分析：
这个是属于误删除某些系统索引文件，导致账号认证失败造成的
解决办法也简单，重新设置账号密码就行了。
cd /usr/share/elasticsearch
bin/elasticsearch-setup-passwords interactive
# 输出结果
Initiating the setup of passwords for reserved users elastic,apm_system,kibana,logstash_system,beats_system,remote_monitoring_user.
You will be prompted to enter passwords as the process progresses.
Please confirm that you would like to continue [y/N]y # 输入y
# 直接输入密码，然后再重复一遍密码，中括号里是账号
Enter password for [elastic]:
Reenter password for [elastic]:
Enter password for [apm_system]:
Reenter password for [apm_system]:
Enter password for [kibana]:
Reenter password for [kibana]:
Enter password for [logstash_system]:
Reenter password for [logstash_system]:
Enter password for [beats_system]:
Reenter password for [beats_system]:
Enter password for [remote_monitoring_user]:
Reenter password for [remote_monitoring_user]:
Changed password for user [apm_system]
Changed password for user [kibana]
Changed password for user [logstash_system]
Changed password for user [beats_system]
Changed password for user [remote_monitoring_user]
Changed password for user [elastic]