pub fn rrf_fuse(lists: &[Vec<ScoredHit>], k: u32, limit: usize) -> Vec<FusedHit>Expand description
Fuse ranked lists with reciprocal rank fusion.
Each hit contributes 1 / (k + rank) per list it appears in, with
1-based ranks. Output is sorted by fused score descending and truncated
to limit entries.