diff --git a/lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswScalarQuantizedVectorsFormat.java b/lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswScalarQuantizedVectorsFormat.java
index 5ebcd2b5179..71506dc312c 100644
--- a/lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswScalarQuantizedVectorsFormat.java
+++ b/lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswScalarQuantizedVectorsFormat.java
@@ -120,10 +120,6 @@ public final class Lucene99HnswScalarQuantizedVectorsFormat extends KnnVectorsFo
     }
     this.maxConn = maxConn;
     this.beamWidth = beamWidth;
-    if (numMergeWorkers > 1 && mergeExec == null) {
-      throw new IllegalArgumentException(
-          "No executor service passed in when " + numMergeWorkers + " merge workers are requested");
-    }
     if (numMergeWorkers == 1 && mergeExec != null) {
       throw new IllegalArgumentException(
           "No executor service is needed as we'll use single thread to merge");
diff --git a/lucene/core/src/test/org/apache/lucene/codecs/lucene99/TestLucene99HnswQuantizedVectorsFormat.java b/lucene/core/src/test/org/apache/lucene/codecs/lucene99/TestLucene99HnswQuantizedVectorsFormat.java
index 0dc7261acb6..65ef03d2ef7 100644
--- a/lucene/core/src/test/org/apache/lucene/codecs/lucene99/TestLucene99HnswQuantizedVectorsFormat.java
+++ b/lucene/core/src/test/org/apache/lucene/codecs/lucene99/TestLucene99HnswQuantizedVectorsFormat.java
@@ -217,9 +217,6 @@ public class TestLucene99HnswQuantizedVectorsFormat extends BaseKnnVectorsFormat
     expectThrows(
         IllegalArgumentException.class,
         () -> new Lucene99HnswScalarQuantizedVectorsFormat(20, 100, 0, 7, false, 0.8f, null));
-    expectThrows(
-        IllegalArgumentException.class,
-        () -> new Lucene99HnswScalarQuantizedVectorsFormat(20, 100, 100, 7, false, null, null));
     expectThrows(
         IllegalArgumentException.class,
         () ->