shubhamvishu commented on code in PR #12799:
URL: https://github.com/apache/lucene/pull/12799#discussion_r1400409812


##########
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:
   Sure I'll change it, but tbh I feel maybe it was better to keep the ES 
itself instead of storing the TE reference because ES is capable of doing other 
things as well that TE does not support yet eg: timeout support etc. I 
understand there is no use case as such currently in hnsw indexing side here 
but if maybe there could be some in future(?). Just wanted to make this point 
here.



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