benwtrent commented on code in PR #13561:
URL: https://github.com/apache/lucene/pull/13561#discussion_r1672837709


##########
lucene/core/src/java/org/apache/lucene/util/hnsw/HnswConcurrentMergeBuilder.java:
##########
@@ -84,7 +88,8 @@ public OnHeapHnswGraph build(int maxOrd) throws IOException {
           });
     }
     taskExecutor.invokeAll(futures);
-    return workers[0].getGraph();
+    frozen = true;
+    return workers[0].getCompletedGraph();

Review Comment:
   Why are we freezing here instead of within `getCompletedGraph` like its done 
for the single threaded builder?



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