fvh highlight doesn't work.

[WMPeople]

Elasticsearch Version

8.2.2

Installed Plugins

nori, kuromoji

Java Version

17.0.2

OS Version

centos 7.9

Problem Description

 MapperService mapperService = createMapperService("""
            { "_doc" : { "properties" : {
                "field" : {
                    "type" : "text",
                    "fields" : {
                        "stemmed" : {
                            "type" : "text",
                            "term_vector" : "with_positions_offsets"
                        }
                    }
                }
            }}}
            """);

        ParsedDocument doc = mapperService.documentMapper().parse(source("""
            { "field" : "here is some text, which is followed by some more text" }
            """));

        {
            // test SimpleFragmentsBuilder case
            SearchSourceBuilder search = new SearchSourceBuilder().query(QueryBuilders.termQuery("field.stemmed", "some"))
                .highlighter(new HighlightBuilder().field("field.stemmed").highlighterType("fvh"));

            assertHighlights(
                highlight(mapperService, doc, search),
                "field.stemmed",
                "here is <em>some</em> text, which is followed by <em>some</em> more text"
            );
        }

in https://github.com/elastic/elasticsearch/blob/master/server/src/test/java/org/elasticsearch/search/fetch/subphase/highlight/FastVectorHighlighterTests.java

When the test is performed in the same way as the test case in the file above, the highlight field is not exposed in the search results.

The highlight for field is exposed, but the highlight for `field.stemmed" is not.

One interesting thing is that if I select "type" other than "fvh", it works fine.

Steps to Reproduce

1. create index
   request :

PUT test_index
{
  "settings": {},
  "mappings": {
    "properties": {
      "field" : {
                    "type" : "text",
                    "term_vector" : "with_positions_offsets",
                    "analyzer": "english",
                    "fields" : {
                        "stemmed" : {
                            "type": "text",
                            "term_vector" : "with_positions_offsets",
                            "analyzer": "english"
                        }
                    }
                }
    }
  }
}

2. insert data
   request :

POST test_index/_doc/1?timeout=5m
{
  "field": "one"
}

3. search with highlight

GET test_index/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "match": {
      "field.stemmed": "one"
    }
        },
        {
          "match": {
            "field": "one"
          }
        }
      ]
    }
  },
  "highlight": {
    "fields":{
        "*": {
          "type": "fvh"
        }
      }
  }
}

response :

{
  "took" : 726,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.36464313,
    "hits" : [
      {
        "_index" : "test_index",
        "_id" : "1",
        "_score" : 0.36464313,
        "_source" : {
          "field" : "one"
        },
        "highlight" : {
          "field" : [
            "<em>one</em>"
          ]
        }
      }
    ]
  }
}

Where is my field.stemmed in highlight? T_T

Logs (if relevant)

No response

[elasticmachine]

Pinging @elastic/es-search (Team:Search)

[jtibshirani]

@WMPeople sorry you ran into this. We fixed it recently in #85815, which will be available in the next minor release 8.3. It was also backported to 7.17 and will be available in 7.17.5.

[WMPeople]

@jtibshirani
Thank you for the reply.
May I know the 8.3.x release date?

[jtibshirani]

@WMPeople we don't share release dates on GitHub, but I can say that we're hard at work preparing the 8.3 release now. You could also check the previous release announcements (8.2, 8.1) to get a sense of the release cadence.

[javanna]

Closing as it was fixed with #85815 .