Hello World

執行 elastic search 需要有java 環境
請先確定系統環境是否已經安裝 java
$ java -version

如果沒有的話，以下步驟安裝
$ sudo apt install default-jre

設定環境變數
$ vi /etc/environment
JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64/"

$ source /etc/environment

安裝 elastic search 步驟
$ wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
$ sudo apt-get install apt-transport-https
$ echo "deb https://artifacts.elastic.co/packages/6.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-6.x.list
$ sudo apt-get update && sudo apt-get install elasticsearch