1.查看证书是否过期

curl -XGET -u elastic http://localhost:9200/_xpack/license?pretty

2.登陆https://register.elastic.co/

3.进入邮箱，下载证书并上传证书到es服务器

4.执行以下命令

curl -XPUT -u elastic http://localhost:9200/_xpack/license?acknowledge=true -H "Content-Type: application/json" -d @license.json
curl -XPOST -u elastic http://localhost:9200/_license/start_basic?acknowledge=true