Unverified50% confidenceFactExact time
Elasticsearch uses k=60 as the default value of rank_constant in its RRF documentation.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/19/2026
First Seen
Valid until: 1/17/2027
Sources
Related Entities
Related Claims
UnverifiedReciprocal rank fusion (RRF) takes 1/(k + rank) for each document in each result list (k is usually 60), sums them, and reranks by total score; it relies only on ranks and requires no normalization.68% similarUnverifiedRRF is a tuning-free rank fusion algorithm that uses only rank positions, accumulating scores as 1/(k+rank), with the constant k typically set to 60.63% similarUnverifiedMicrosoft's hybrid search documentation describes running keyword search and vector search in parallel, then merging the ranked lists with Reciprocal Rank Fusion (RRF), with k set to the 60 used in the original paper.56% similarUnverifiedPre-storing or quickly computing Top-K results at each prefix node enables constant query cost — returning a fixed Top-K regardless of how many entries the prefix matches — and is the key to flattening P99 latency.55% similarUnverifiedQdrant adjusts ef by passing "params": { "hnsw_ef": 128 } on each search, and its index documentation states that ef defaults to the value of ef_construct, which is 100 out of the box.54% similar
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