What’s the sort score difference between elasticsearch7.9.3 and elasticsearch6.8.0?

Elastic Stack Elasticsearch
1

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

Given you have a topic on this already, let's continue the discussion at What's the sort default score difference between elasticsearch7.9.3 and elasticsearch6.8.0