Indices_boost not work for has_child query

Elastic Stack Elasticsearch
1

Context

  • Elasticsearch version: 8.8.0-SNAPSHOT (Commit: 56633e0a2934b03090ab726c33e5289129c98bfe [56633e0])
  • Lucene version: lucene-join-9.6.0-SNAPSHOT

I create two equals indices:

PUT /question_answer_1
{
  "aliases": {
    "question_answer": {}
  },
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 0
  },
  "mappings": {
    "properties": {
      "text": { "type": "text" },
      "join": {
        "type": "join",
        "relations": {
          "question": "answer" 
        }
      }
    }
  }
}

PUT /question_answer_2
{
  "aliases": {
    "question_answer": {}
  },
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 0
  },
  "mappings": {
    "properties": {
      "text": { "type": "text" },
      "join": {
        "type": "join",
        "relations": {
          "question": "answer" 
        }
      }
    }
  }
}

So, i populated with following data:

PUT question_answer_1/_doc/1?refresh
{
  "text": "what is the first question?",
  "join": { "name": "question" }
}

PUT question_answer_1/_doc/1-1?routing=1&refresh
{
  "text": "this is the first response of the first question",
  "join": { "name": "answer", "parent": "1" }
}

PUT question_answer_1/_doc/1-2?routing=1&refresh
{
  "text": "this is the second response of the first question",
  "join": { "name": "answer", "parent": "1" }
}

PUT question_answer_2/_doc/1?refresh
{
  "text": "what is the first question?",
  "join": { "name": "question" }
}

PUT question_answer_2/_doc/1-1?routing=1&refresh
{
  "text": "this is the first response of the first question",
  "join": { "name": "answer", "parent": "1" }
}

PUT question_answer_2/_doc/1-2?routing=1&refresh
{
  "text": "this is the second response of the first question",
  "join": { "name": "answer", "parent": "1" }
}

Problem

When i make this query:

GET question_answer/_search
{
  "_source": false,
  "query": {
    "has_child": {
      "type": "answer",
      "score_mode": "max", 
      "query": {
        "match": {
          "text": "second"
        }
      }
    }
  }
}

the return is:

{
    "took": 44,
    "timed_out": false,
    "_shards": {
        "total": 2,
        "successful": 2,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 2,
            "relation": "eq"
        },
        "max_score": 0.91568196,
        "hits": [
            {
                "_index": "question_answer_1",
                "_id": "1",
                "_score": 0.91568196
            },
            {
                "_index": "question_answer_2",
                "_id": "1",
                "_score": 0.91568196
            }
        ]
    }
}

If i use indices_boost to prioritize the index question_answer_1 as following:

GET question_answer/_search
{
  "indices_boost": [
    {
      "question_answer_1": 10
    }
  ],
  "_source": false,
  "query": {
    "has_child": {
      "type": "answer",
      "score_mode": "max", 
      "query": {
        "match": {
          "text": "second"
        }
      }
    }
  }
}

I expected that the document of _id=1 and _index=question_answer_1 return _score=9.1568196 (10 * 0.91568196), but the result is the same as before:

{
    "took": 8,
    "timed_out": false,
    "_shards": {
        "total": 2,
        "successful": 2,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 2,
            "relation": "eq"
        },
        "max_score": 0.91568196,
        "hits": [
            {
                "_index": "question_answer_1",
                "_id": "1",
                "_score": 0.91568196
            },
            {
                "_index": "question_answer_2",
                "_id": "1",
                "_score": 0.91568196
            }
        ]
    }
}

Then i clonclude that the indices_boost does not work for has_child query. Is it right?

Debuging the Elasticsearch, i saw the following code in the GlobalOrdinalsWithScoreQuery Lucene class:

    return new W(
        this,
        toQuery.createWeight(searcher, org.apache.lucene.search.ScoreMode.COMPLETE_NO_SCORES, 1f));

I change to

    return new W(
        this,
        toQuery.createWeight(searcher, scoreMode, boost));

but does not work.

The toString method of class GlobalOrdinalsWithScoreQuery shows the following string:
(GlobalOrdinalsQuery{joinField=join#questionmin=1max=2147483647fromQuery=+text:second #join:answer})^10.0

2

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