Error While Updating Array using painless script

[Gautam_Vanani]

Hi,
I'm facing issue while updating array field

{ "error": {
"root_cause": [
  {
    "type": "remote_transport_exception",
    "reason": "[3BcGP3Y][127.0.0.1:9300][indices:data/write/update[s]]"
  }
],
"type": "illegal_argument_exception",
"reason": "failed to execute script",
"caused_by": {
  "type": "script_exception",
  "reason": "runtime error",
  "caused_by": {
    "type": "class_cast_exception",
    "reason": "Cannot apply [+] operation to types [java.util.ArrayList] and [java.util.ArrayList]."
  },
  "script_stack": [
    "ctx._source.stone_ids += params.ids",
    "                               ^---- HERE"
  ],
  "script": "ctx._source.stone_ids += params.ids",
  "lang": "painless"
}}, "status": 400 }

while trying following update operation,
> POST /search_history/stone/2/_update
> {
> "script" : {
> "inline": "ctx._source.stone__ids += params.ids",
> "lang": "painless",
> "params" : {
> "ids" : [4,5]
> }
> },
> "upsert" : {
> "stone_ids":[4,5]
> }
> }

can anyone help me in this?

[nik9000 (Nik Everett)]

ctx._source.stone_ids.add(params.ids) should do it.

[Gautam_Vanani]

@nik9000 thank you for reply
I tried with addAll() method it is working properly but with duplicate values.
Is there any settings available to notify that consider this particular field as Set not List to avoid duplication??