Elasticsearch是一个全文搜索引擎。安装Elasticsearch时需要先安装Java。
要求的jdk版本1.7以上的。
以下是官方文档：
Elasticsearch requires at least Java 7. Specifically as of this writing, it is recommended that you use the Oracle JDK version 1.8.0_25. Java installation varies from platform to platform so we won’t go into those details here. Oracle’s recommended installation documentation can be found on Oracle’s website. Suffice to say, before you install Elasticsearch, please check your Java version first by running (and then install/upgrade accordingly if needed): 需要jdk1.7 以上版本
