1. Install ubuntu server.
2. Install JAVA & prepare /etc/environment
2.1 sudo /etc/environment
2.2 modify JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64/"
2.3 source /etc/environment
*** 檢測是否設置完成**
2.4 echo $JAVA_HOME
3. Install elasticsearch
3.1 curl -fsSL https://artifacts.elastic.co/GPG-KEY-elasticsearch |sudo gpg --dearmor -o /usr/share/keyrings/elastic.gpg