Elasticsearch Update Array Item by Query

POST subjects/_update_by_query
{
  "query": {
    "match": {
      "handleList.platform": "0"
    }
  },
  "script": {
    "source": """if (ctx._source.handleList != null) {
        for (int i=ctx._source.handleList.length-1; i>=0; i--) {  
          if (ctx._source.handleList[i]['platform'] == "0") {
                    ctx._source.handleList[i]['platform'] = "TikTok";
                    break;
              }}}""",
    "lang": "painless"
  }
}