javanna commented on code in PR #12799:
URL: https://github.com/apache/lucene/pull/12799#discussion_r1399656766


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lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswVectorsWriter.java:
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@@ -489,8 +490,9 @@ private void writeMeta(
   private HnswGraphMerger createGraphMerger(
       FieldInfo fieldInfo, RandomVectorScorerSupplier scorerSupplier) {
     if (mergeExec != null) {
+      TaskExecutor taskExecutor = new TaskExecutor(mergeExec);

Review Comment:
   Can't this class hold directly a TaskExecutor instead of an ExecutorService? 
The null check can be made against the task executor too? That way we would 
create a single task executor instance?



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