hellosunil opened a new issue, #14769:
URL: https://github.com/apache/lucene/issues/14769
### Description
Hello, I have a question about the RRF method in TopDocs and would like to
raise this issue.
In the current code:
`for (int i = 0; i < topDoc.scoreDocs.length; ++i) {
ScoreDoc scoreDoc = topDoc.scoreDocs[i];
int rank = i + 1;
double rrfScoreContribution = 1d / Math.addExact(k, rank);
rrfScore.compute(
new ShardIndexAndDoc(scoreDoc.shardIndex, scoreDoc.doc),
(key, score) -> (score == null ? 0 : score) + rrfScoreContribution);
}`
The rank is unconditionally incremented by 1 (i + 1) based on position.
However, when all documents have identical scores (such as search results on
keyword fields), this approach could lead to incorrect RRF scores.
I'm curious about why documents with identical scores are not assigned the
same rank. Shouldn't tied scores receive equal ranking treatment?
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