Elasticsearch [6.8] > Painless > Upsert into arrays

elasticsearch_6_8_upsert_into_array.painless.es

POST events/user/:id/_update
{
  "script": {
    "lang": "painless",
    "source": "if (ctx._source.on_screen_view == null) { ctx._source.on_screen_view = [] }\nfor (int i = 0; i < params.events.length; i++) {\nctx._source.on_screen_view.add(params.events[i])\n}\n",
    "params": {
      "events": [
        "2019-07-10T21:57:46.173Z",
        "2019-07-10T20:49:34.429Z",
        "2019-07-10T20:50:08.135Z"
      ]
    }
  },
  "upsert": {
    "on_screen_view": [
      "2019-07-10T21:57:46.173Z",
      "2019-07-10T20:49:34.429Z",
      "2019-07-10T20:50:08.135Z"
    ]
  }
}

// references:
// https://www.elastic.co/guide/en/elasticsearch/reference/6.8/docs-update.html
// https://www.elastic.co/guide/en/elasticsearch/painless/current/painless-walkthrough.html
// https://www.compose.com/articles/how-to-script-painless-ly-in-elasticsearch/