1.安装open jdk 最低版本为1.8，使用java -version查看
openjdk version "1.8.0_312" OpenJDK Runtime Environment (build 1.8.0_312-b07) OpenJDK 64-Bit Server VM (build 25.312-b07, mixed mode)
2.进入ES官网https://www.elastic.co/cn/downloads/elasticsearch下载压缩包，选择“Linux x86_64”
curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.15.1-linux-x86_64.tar.gz
3.创建一个目录，复制压缩文件至创建的目录中，然后进行解压
tar -zxvf elasticsearch-7.15.1-linux-x86_64.tar.gz
4.修改系统内核参数
vim /etc/
