Page Comparison

{
  "script": {
    "source": "def set=new LinkedHashSet(ctx._source.instances);set.addAll(params.ins);params.del.forEach(set::remove);ctx._source.instances=set",
    "lang": "painless",
    "params": {
      "ins": [ "instanceId#1|type#1", "instanceId#2|type#1", "instanceId#3|type#1" ],
	      "del": [ "instanceId#4|type#1"]
    }
  },
  "upsert": {
    "id": "abshc",
    "name": "Antoniou, Grigoris",
    "contributorTypeId": "type#1",
    "instances": [ "instanceId#1|type#1", "instanceId#2|type#1", "instanceId#3|type#1" ]
  }
}