[ELK] xpack basic license 등록

1. https://register.elastic.co/ 가입

2. 

POST _xpack/license

{

  "licenses": [

    {

      "uid":"893361dc-9749-4997-93cb-802e3d7fa4xx",

      "type":"basic",

      "issue_date_in_millis":1411948800000,

      "expiry_date_in_millis":1914278399999,

      "max_nodes":1,

      "issued_to":"issuedTo",

      "issuer":"issuer",

      "signature":"xx"

    }

    ]

}

or

2.

curl -XPUT -u <user> 'http://<host>:<port>/_xpack/license' -H "Content-Type: application/json" -d @license.json

3. GET _xpack/license