一、Marvel插件介绍
Marvel插件：在簇中从每个节点汇集数据。这个插件必须每个节点都得安装。
Marvel是Elasticsearch的管理和监控工具，在开发环境下免费使用。它包含了一个叫做Sense的交互式控制台，使用户方便的通过浏览器直接与Elasticsearch进行交互。
二、Marvel插件安装
第一步：
[elasticsearch@5b9dbaaa148a bin]$ ./plugin install license
-> Installing license…
Trying https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/license/2.3.2/license-2.3.2.zip …
Downloading …….DONE
Verifying https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/license/2.3.2/license-2.3.2.zip checksums if available …
Downloading .DONE
Installed license into /data/elasticsearch/plugins/license
第二步：
[elasticsearch@5b9dbaaa148a bin]$ ./plugin install marvel-agent
-> Installing marvel-agent…
Trying https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/marvel-agent/2.3.2/marvel-agent-2.3.2.zip …
Downloading ……….DONE
Verifying https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/marvel-agent/2.3.2/marvel-agent-2.3.2.zip checksums if available …
Downloading .DONE
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@ WARNING: plugin requires additional permissions @
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* java.lang.RuntimePermission setFactory
* javax.net.ssl.SSLPermission setHostnameVerifier
See http://docs.oracle.com/javase/8/docs/technotes/guides/security/permissions.html
for descriptions of what these permissions allow and the associated risks.
Continue with installation? [y/N]y
Installed marvel-agent into /data/elasticsearch/plugins/marvel-agen