jtibshirani commented on a change in pull request #601:
URL: https://github.com/apache/lucene/pull/601#discussion_r784189861



##########
File path: 
lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90HnswVectorsWriter.java
##########
@@ -145,6 +139,64 @@ public void writeField(FieldInfo fieldInfo, 
KnnVectorsReader knnVectorsReader)
       throw new IllegalArgumentException(
           "Indexing an HNSW graph requires a random access vector values, got 
" + vectors);
     }
+
+    long vectorDataLength = vectorData.getFilePointer() - vectorDataOffset;
+    long vectorIndexLength = vectorIndex.getFilePointer() - vectorIndexOffset;
+    writeMeta(
+        fieldInfo,
+        vectorDataOffset,
+        vectorDataLength,
+        vectorIndexOffset,
+        vectorIndexLength,
+        count,
+        docIds);
+    writeGraphOffsets(meta, offsets);
+  }
+
+  @Override
+  public void mergeField(FieldInfo fieldInfo, MergeState mergeState) throws 
IOException {

Review comment:
       I didn't go this direction because I suspected there could be 
performance hit for normal flush. I'll test it out in a follow-up though, it 
could definitely simplify this change (and more)!




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