benwtrent commented on code in PR #13627:
URL: https://github.com/apache/lucene/pull/13627#discussion_r1706826818


##########
lucene/core/src/java/org/apache/lucene/index/DocumentsWriter.java:
##########
@@ -430,10 +430,16 @@ long updateDocuments(
       }
       flushingDWPT = flushControl.doAfterDocument(dwpt);
     } finally {
-      if (dwpt.isFlushPending() || dwpt.isAborted()) {
-        dwpt.unlock();
-      } else {
-        perThreadPool.marksAsFreeAndUnlock(dwpt);
+      // If a flush is occurring, we don't want to allow this dwpt to be reused
+      // If it is aborted, we shouldn't allow it to be reused
+      // If the deleteQueue is advanced, this means the maximum seqNo has been 
set and it cannot be
+      // reused
+      synchronized (flushControl) {

Review Comment:
   @jpountz so we are saying it is ok for a DWPT to be marked as free and 
reusable when `isFlushPending` is true?



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