What's the sort default score difference between elasticsearch7.9.3 and elasticsearch6.8.0

Elastic Stack Elasticsearch
1

hi,

i test in the elasticsearch7.9.3 using below query clause:

URL:
https://elastic:password@MACHINENAME:9500/indexname/_search
query post body:

  {
"explain": true,
"from": 0,
"size": 130,
"query": {
    "bool": {
        "should": {
            "bool": {
                "should": [
                    {
                        "match_phrase_prefix": {
                            "TitleFieldAC": {
                                "query": "test",
                                "boost": 200
                            }
                        }
                    },
                    {
                        "match_phrase_prefix": {
                            "SummaryFieldAC": {
                                "query": "test",
                                "boost": 100
                            }
                        }
                    },
                    {
                        "multi_match": {
                            "query": "test",
                            "type": "cross_fields",
                            "operator": "or",
                            "auto_generate_synonyms_phrase_query": false,
                            "boost": 1
                        }
                    }
                ]
            }
        },
        "minimum_should_match": "1"
    }
},
"sort": [
    {
        "_score": "desc"
    }
]
}

but i found that in elasticsearch6.8.0, sort result is not same as elasticsearch7.9.3's sort result using same query clause,

i want to know, whether the two elasticsearch versions sort by score is different or my usage have issue? thanks.
2

Can you please edit your post and remove the formatting from the plain text, it's very difficult to read your question.

3

hi Mark,

please see my latest message, i have formatted the code above, thanks.

4

@warkolm

do you have any suggestion for the score sort issue? thanks

5

We did switch from TFIDF to BM25 between 6>7, so that might be impact things. But I don't know enough detail on that area to be able to provide you a definitive answer sorry

6

@warkolm

Why need to change from TFIDf to BM25 from 6.x to 7.x version? i don't particularly understand, thanks.

7

BM25 is a more modern scoring algorithm.

8

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.