zhaih commented on code in PR #13124:
URL: https://github.com/apache/lucene/pull/13124#discussion_r1523620861


##########
lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswVectorsFormat.java:
##########
@@ -152,7 +154,25 @@ public Lucene99HnswVectorsFormat() {
    * @param beamWidth the size of the queue maintained during graph 
construction.
    */
   public Lucene99HnswVectorsFormat(int maxConn, int beamWidth) {
-    this(maxConn, beamWidth, DEFAULT_NUM_MERGE_WORKER, null);
+    super("Lucene99HnswVectorsFormat");
+    if (maxConn <= 0 || maxConn > MAXIMUM_MAX_CONN) {
+      throw new IllegalArgumentException(
+          "maxConn must be positive and less than or equal to "
+              + MAXIMUM_MAX_CONN
+              + "; maxConn="
+              + maxConn);
+    }
+    if (beamWidth <= 0 || beamWidth > MAXIMUM_BEAM_WIDTH) {
+      throw new IllegalArgumentException(
+          "beamWidth must be positive and less than or equal to "
+              + MAXIMUM_BEAM_WIDTH
+              + "; beamWidth="
+              + beamWidth);
+    }
+    this.maxConn = maxConn;
+    this.beamWidth = beamWidth;
+    this.mergeExec = null;
+    this.numMergeWorkers = 1;

Review Comment:
   Yeah I agree, so for now we'll just fix it at 8?



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