nfsantos commented on code in PR #2410:
URL: https://github.com/apache/jackrabbit-oak/pull/2410#discussion_r2250353374


##########
oak-search-elastic/src/main/java/org/apache/jackrabbit/oak/plugins/index/elastic/query/async/ElasticResultRowAsyncIterator.java:
##########
@@ -176,7 +214,10 @@ public boolean on(Hit<ObjectNode> searchHit) {
     @Override
     public void endData() {
         try {
-            queue.put(POISON_PILL);
+            boolean success = queue.offer(POISON_PILL, enqueueTimeoutMs, 
TimeUnit.MILLISECONDS);
+            if (!success) {
+                LOG.warn("Timeout waiting to insert poison pill into the 
iterator queue. The iterator might not be closed properly.");

Review Comment:
   `endData()` is called from two locations:
   - `ElasticInsecureFacetAsyncProvider.on` - This is called at the end of the 
results, so there will be no more calls to the iterator. And if we throw an 
exception here, it will be swallowed by the driver as it executes on the event 
handling thread of the driver.
   - `ElasticQueryScanner.close` - The scanner is closing, so any further calls 
to `hasNext()` will see `isClosed` set to true and will no try to read from the 
queue.
   
   I prefer to leave it just as a warning, as throwing an exception could lead 
to unexpected results.



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