benwtrent commented on code in PR #12660:
URL: https://github.com/apache/lucene/pull/12660#discussion_r1370023343


##########
lucene/core/src/java/org/apache/lucene/codecs/lucene95/Lucene95HnswVectorsFormat.java:
##########
@@ -146,18 +148,24 @@ public final class Lucene95HnswVectorsFormat extends 
KnnVectorsFormat {
    */
   private final int beamWidth;
 
+  private final int mergeWorkers;
+
   /** Constructs a format using default graph construction parameters */
   public Lucene95HnswVectorsFormat() {
     this(DEFAULT_MAX_CONN, DEFAULT_BEAM_WIDTH);
   }
 
+  public Lucene95HnswVectorsFormat(int maxConn, int beamWidth) {
+    this(maxConn, beamWidth, DEFAULT_MERGE_WORKER);
+  }
+
   /**
    * Constructs a format using the given graph construction parameters.
    *
    * @param maxConn the maximum number of connections to a node in the HNSW 
graph
    * @param beamWidth the size of the queue maintained during graph 
construction.
    */
-  public Lucene95HnswVectorsFormat(int maxConn, int beamWidth) {
+  public Lucene95HnswVectorsFormat(int maxConn, int beamWidth, int 
mergeWorkers) {

Review Comment:
   @zhaih I understand. We don't need to make the bigger move until we see the 
need for parallel merges elsewhere.
   
   But, I do think it should be an `ExecutorService` that is passed in here, 
not a number of workers.



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