Elasticsearch 6 to 7 scoring change

My service which run with Elasticsearch 6.4 has a function score query with boost and weight to find the most match document for user. After migrate to Elasticsearch 7.10 (same mapping, number of shards, data count) I found that the same function score query had different sequence of results. I have observed through explain api and the scoring logic seems to have changed. I wonder if there has any way to make the query result consistent as Elasticsearch 6?

Elasticsearch 7.10 is EOL and no longer supported. Please upgrade ASAP.

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