Change elastic password using curl

Donghuas-MacBook-Air:bin donghua$ curl -XPUT -u elastic 'localhost:9200/_xpack/security/user/elastic/_password' -d '{

  "password" : "elastic"   

}'

Enter host password for user 'elastic':

{"error":"Content-Type header [application/x-www-form-urlencoded] is not supported","status":406}

Donghuas-MacBook-Air:bin donghua$ curl -XPUT -H 'Content-Type: application/json' -u elastic 'localhost:9200/_xpack/security/user/elastic/_password' -d '{                   

  "password" : "elastic"

}'

Enter host password for user 'elastic':

{}

Donghuas-MacBook-Air:bin donghua$ curl -XGET -u elastic:elastic localhost:9200/?pretty

{

  "name" : "0rArjNg",

  "cluster_name" : "elasticsearch",

  "cluster_uuid" : "dZYuMdDkQICV_oS2-nvmpQ",

  "version" : {

    "number" : "6.2.4",

    "build_hash" : "ccec39f",

    "build_date" : "2018-04-12T20:37:28.497551Z",

    "build_snapshot" : false,

    "lucene_version" : "7.2.1",

    "minimum_wire_compatibility_version" : "5.6.0",

    "minimum_index_compatibility_version" : "5.0.0"

  },

  "tagline" : "You Know, for Search"

}