1、下载安装包：
2、常见错误及解决方案：
2.1、[unknown] uncaught exception in thread [main]org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
切换用户为普通用户：
sudo aibaiyang
2.1、Exception in thread "main" java.nio.file.AccessDeniedException: /usr/local/software/elasticsearch-6.8.3/config/jvm.options
切换到root账号：
su
给aibaiyang账号赋予elasticsearch-6.8.3 文件夹权限：
chown -R aibaiyang:aibaiyang /usr/local/software/elasticsearch-6.8.3