From 984c12a77ae050963c474b71883e1e7f459085d8 Mon Sep 17 00:00:00 2001
From: Ignacio Vera <ignacio.vera@elastic.co>
Date: Mon, 17 Nov 2025 14:54:59 +0100
Subject: [PATCH] [DiskBBQ] Fix Computation of DocsPerCentroid

---
 .../codec/vectors/diskbbq/next/ESNextDiskBBQVectorsReader.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/src/main/java/org/elasticsearch/index/codec/vectors/diskbbq/next/ESNextDiskBBQVectorsReader.java b/server/src/main/java/org/elasticsearch/index/codec/vectors/diskbbq/next/ESNextDiskBBQVectorsReader.java
index 03725c78fe107..8e4fdab12930b 100644
--- a/server/src/main/java/org/elasticsearch/index/codec/vectors/diskbbq/next/ESNextDiskBBQVectorsReader.java
+++ b/server/src/main/java/org/elasticsearch/index/codec/vectors/diskbbq/next/ESNextDiskBBQVectorsReader.java
@@ -123,7 +123,7 @@ public CentroidIterator getCentroidIterator(
         float approximateDocsPerCentroid = approximateCost / numCentroids;
         if (approximateDocsPerCentroid <= 1.25) {
             // TODO: we need to make this call to build the iterator, otherwise accept docs breaks all together
-            approximateDocsPerCentroid = acceptDocs.cost();
+            approximateDocsPerCentroid = (float) acceptDocs.cost() / numCentroids;
         }
         final int bitsRequired = DirectWriter.bitsRequired(numCentroids);
         final long sizeLookup = directWriterSizeOnDisk(values.size(), bitsRequired);