javanna commented on code in PR #12799:
URL: https://github.com/apache/lucene/pull/12799#discussion_r1400536223


##########
lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswVectorsFormat.java:
##########
@@ -160,12 +160,12 @@ public Lucene99HnswVectorsFormat(int maxConn, int 
beamWidth) {
    * @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.
    * @param numMergeWorkers number of workers (threads) that will be used when 
doing merge. If
-   *     larger than 1, a non-null {@link ExecutorService} must be passed as 
mergeExec
-   * @param mergeExec the {@link ExecutorService} that will be used by ALL 
vector writers that are
+   *     larger than 1, a non-null {@link TaskExecutor} must be passed as 
mergeExec
+   * @param mergeExec the {@link TaskExecutor} that will be used by ALL vector 
writers that are
    *     generated by this format to do the merge
    */
   public Lucene99HnswVectorsFormat(
-      int maxConn, int beamWidth, int numMergeWorkers, ExecutorService 
mergeExec) {
+      int maxConn, int beamWidth, int numMergeWorkers, TaskExecutor mergeExec) 
{

Review Comment:
   Thanks for voicing your opinion. My main goal was to create one instance of 
TaskExecutor per Executor, hence create it as soon as possible. I also believe 
that we will want to extend TaskExecutor's capabilities instead of relying on 
executor service capabilities in specific places.



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