Minor removal of unused code for diskbbq (#136330)

removing unused or unuseful code.

Author: benwtrent

server/src/main/java/org/elasticsearch/index/codec/vectors/diskbbq/ES920DiskBBQVectorsReader.java

@@ -352,8 +352,9 @@ private static void score(
     public PostingVisitor getPostingVisitor(FieldInfo fieldInfo, IndexInput indexInput, float[] target, Bits acceptDocs)
         throws IOException {
         FieldEntry entry = fields.get(fieldInfo.number);
-        final int maxPostingListSize = indexInput.readVInt();
-        return new MemorySegmentPostingsVisitor(target, indexInput, entry, fieldInfo, maxPostingListSize, acceptDocs);
+        // max postings list size, no longer utilized
+        indexInput.readVInt();
+        return new MemorySegmentPostingsVisitor(target, indexInput, entry, fieldInfo, acceptDocs);
     }
 
     @Override
@@ -393,14 +394,8 @@ private static class MemorySegmentPostingsVisitor implements PostingVisitor {
         final float[] correctiveValues = new float[3];
         final long quantizedVectorByteSize;
 
-        MemorySegmentPostingsVisitor(
-            float[] target,
-            IndexInput indexInput,
-            FieldEntry entry,
-            FieldInfo fieldInfo,
-            int maxPostingListSize,
-            Bits acceptDocs
-        ) throws IOException {
+        MemorySegmentPostingsVisitor(float[] target, IndexInput indexInput, FieldEntry entry, FieldInfo fieldInfo, Bits acceptDocs)
+            throws IOException {
             this.target = target;
             this.indexInput = indexInput;
             this.entry = entry;

server/src/main/java/org/elasticsearch/index/codec/vectors/diskbbq/ES920DiskBBQVectorsWriter.java

@@ -531,8 +531,6 @@ public int size() {
     public CentroidAssignments calculateCentroids(FieldInfo fieldInfo, FloatVectorValues floatVectorValues, float[] globalCentroid)
         throws IOException {
 
-        long nanoTime = System.nanoTime();
-
         // TODO: consider hinting / bootstrapping hierarchical kmeans with the prior segments centroids
         CentroidAssignments centroidAssignments = buildCentroidAssignments(floatVectorValues, vectorPerCluster);
         float[][] centroids = centroidAssignments.centroids();
@@ -549,7 +547,6 @@ public CentroidAssignments calculateCentroids(FieldInfo fieldInfo, FloatVectorVa
         }
 
         if (logger.isDebugEnabled()) {
-            logger.debug("calculate centroids and assign vectors time ms: {}", (System.nanoTime() - nanoTime) / 1000000.0);
             logger.debug("final centroid count: {}", centroids.length);
         }
         return centroidAssignments;

server/src/main/java/org/elasticsearch/index/codec/vectors/diskbbq/next/ESNextDiskBBQVectorsWriter.java

@@ -519,8 +519,6 @@ public int size() {
     public CentroidAssignments calculateCentroids(FieldInfo fieldInfo, FloatVectorValues floatVectorValues, float[] globalCentroid)
         throws IOException {
 
-        long nanoTime = System.nanoTime();
-
         // TODO: consider hinting / bootstrapping hierarchical kmeans with the prior segments centroids
         CentroidAssignments centroidAssignments = buildCentroidAssignments(floatVectorValues, vectorPerCluster);
         float[][] centroids = centroidAssignments.centroids();
@@ -537,7 +535,6 @@ public CentroidAssignments calculateCentroids(FieldInfo fieldInfo, FloatVectorVa
         }
 
         if (logger.isDebugEnabled()) {
-            logger.debug("calculate centroids and assign vectors time ms: {}", (System.nanoTime() - nanoTime) / 1000000.0);
             logger.debug("final centroid count: {}", centroids.length);
         }
         return centroidAssignments;