首先需要去官网上注册一个免费的license

• https://register.elastic.co/xpack_register

收到邮件，下载license

• http://license.elastic.co/registration/download/bf339f35-201a-4e2c-ad8a-a58b06448a77

查看对应版本的激活方法

• https://www.elastic.co/guide/en/elasticsearch/reference/6.2/update-license.html
  使用curl激活

curl -X POST "ip:port/_xpack/license?pretty" -H 'Content-Type: application/json' -d'
{
  "licenses": [
    {
      "uid":"xxxxxxxx",
      "type":"basic",
      "issue_date_in_millis":1631318400000,
      "expiry_date_in_millis":1662940799999,
      "max_nodes":100,
      "issued_to":"xxxx",
      "issuer":"Web Form",
      "signature":"",
	  "start_date_in_millis":1631318400000
    }
    ]
}
'

结果

查看license的有效期

• curl -XGET ‘http://ip:port/_xpack/license’