FDM- Unable to create Uniqueness constraint

Hi Team, 

I am trying to use uniqueness constraint in model using Cognite UI - 

type EntityNew @container(indexes: [{identifier : "entityTypeIndex", fields : ["id"]}], constraints : [{identifier:"id",constraintType:UNIQUENESS,fields:["id"]}]){

  id: String!

  name: String!

  dept: Department

}

type Department{

  name: String

}

I am getting error - invalid: 400 Bad Request. Text: "{ "error": { "code": 400, "message": "Missing required field: constraintType" } }" I also tried using GraphQL API and facing same issue. Can you please help.