https://172.15.3.xx:9200/
http://172.15.3.xx:9200/_all?pretty
https://172.15.3.xx:9200/_cluster/health?pretty
https://172.15.3.xx:9200/_cat/health?v&pretty&h=status
status的意义:
+ green 绿灯: 所有分片都正确运行，集群非常健康。
+ yellow 黄灯: 所有主分片都正确运行，但是有副本分片缺失。
这种情况意味着 ES 当前还是正常运行的，但是有一定风险。
注意，在 Kibana4 的 server 端启动逻辑中，即使是黄灯状态，Kibana 4 也会拒绝启动，死循环等待集群状态变成绿灯后才能继续运行。
+ red 红灯: 有主分片缺失。这部分数据完全不可用。而考虑到 ES 在写入端是简单的取余算法，轮到这个分片上的数据也会持续写入报错。
https://172.15.3.xx:9200/_cat
https://172.15.3.xx:9200/_cat/indices?pretty
https://172.15.3.xx:9200/_cat/shards?v
查看碎片情况(主要看: UNASSIGNED 的碎片)
https://172.15.3.xx:9200/_cluster/health?level=shards&pretty
https://172.15.3.xx:9200/_cat/plugins
https://172.15.3.xx:9200/_cat/health
https://172.15.3.xx:9200/_cat/master?pretty
https://172.15.3.xx:9200/_cat/nodes?v
https://172.15.3.xx:9200/_nodes?pretty
https://172.15.3.xx:9200/_nodes/_master?pretty
https://172.15.3.xx:9200/<索引名>/_close
https://172.15.3.xx:9200/<索引名>/_recovery?pretty
https://172.15.3.xx:9200/_searchguard/authinfo?pretty
https://172.15.3.xx:9200/_searchguard/health
https://172.15.3.xx:9200/_xpack?pretty
https://172.15.3.xx:9200/_xpack/security/_authenticate?pretty
https://172.15.3.xx:9200/_xpack/security/user/elastic/_password
https://172.15.3.xx:9200/_xpack/license/
curl -XPOST --insecure -u admin:admin 'https://172.15.3.xx:9200/_xpack/license/start_trial?acknowledge=true&pretty
https://license.elastic.co/registration
https://repo1.maven.org/maven2/com/floragunn/search-guard-tlstool/1.7/search-guard-tlstool-1.7.tar.gz
https://artifacts.elastic.co/downloads/kibana/kibana-6.4.1-linux-x86_64.tar.gz
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