default field value indexes not recognised

[mingard]

Expected behavior

a config containing a sort of createdAt and an index of createdAt should save successfully through a request to /config

e.g.

"sort": "createdAt",
"index": [
      {
        "keys": {
          "createdAt" : 1
        }
      },
      {
        "keys": {
          "name" : 1
        }
      }
     ],

Actual behavior

An error is thrown:

{
  "statusCode": 400,
  "success": false,
  "errors": [
    {
      "code": "API-0001",
      "title": "Missing Index Key",
      "details": "'createdAt' is specified as the primary sort field, but is missing from the index key collection.",
      "docLink": "http://docs.dadi.tech/errors/api/API-0001"
    }
  ]
}

[jimlambie]

Closed via 450540d