ElasticSearch Painless script: How to iterate in an array of Nested Objects

Question

I am trying to create a script using the script_score of the function_score. I have several documents whose rankings field is type=\

Answer 1

You can access _source via params._source. This one will work:

PUT /rankings/result/1?refresh
{
  "rankings": [
    {
      "rank1": 1051,
      "rank2": 78.5,
      "subject": "s1"
    },
    {
      "rank1": 45,
      "rank2": 34.7,
      "subject": "s2"
    }
  ]
}

POST rankings/_search

POST rankings/_search
{
  "query": {
    "match": {
      "_id": "1"
    }
  },
  "script_fields": {
    "script_score": {
      "script": {
        "lang": "painless",
        "inline": "double sum = 0.0; for (item in params._source.rankings) { sum += item.rank2; } return sum;"
      }
    }
  }
}

DELETE rankings