Elasticsearch设置jvm heap size

1.新增jvm.extension.options文件
vim /opt/elasticsearch/config/jvm.options.d/jvm.extension.options
2.增加如下内容

## JVM heap size
-Xms2g
-Xmx2g
参考：https://www.elastic.co/guide/en/elasticsearch/reference/current/advanced-configuration.html