参考：https://www.cnblogs.com/anech/p/15957607.html

1、安装elastic search7

#手动下载安装
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.17.1-amd64.deb

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.17.1-amd64.deb.sha512
shasum -a 512 -c elasticsearch-7.17.1-amd64.deb.sha512 

sudo dpkg -i elasticsearch-7.17.1-amd64.deb

#删除下载文件
sudo rm -r elasticsearch-7.17.1-amd64.deb && sudo rm -r elasticsearch-7.17.1-amd64.deb.sha512

#运行 Elasticsearch systemd
sudo /bin/systemctl daemon-reload

2、启动Elasticsearch

sudo systemctl enable elasticsearch.service && sudo systemctl start elasticsearch.service

 3、验证Elasticsearch是否正常

curl -X GET "localhost:9200/"

还是没安装好呢，怎么办呢