abhioncbr commented on code in PR #12866:
URL: https://github.com/apache/pinot/pull/12866#discussion_r1559826386


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/creator/impl/vector/lucene95/HnswVectorsFormat.java:
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@@ -19,10 +19,10 @@
 package org.apache.pinot.segment.local.segment.creator.impl.vector.lucene95;
 
 import java.io.IOException;
+import org.apache.lucene.backward_codecs.lucene95.Lucene95HnswVectorsFormat;

Review Comment:
   
   > Does this mean after upgrading Lucece to 0.9.10:
   > 
   > 1. We can only write index with lucene99 based codecs?
   
   True, after upgrading Lucece to 0.9.10, we can only write an index based on 
lucene99.
   
   > 2. If a new generated index is served by an old server (running Lucene 
9.8.0), will it break?
   
   I am unsure, but I will say it will break if I have to guess. The only thing 
is this vector functionality (classes) got added in Pinot on Dec/23, so I am 
not sure how much it is getting used. Maybe @xiangfu0 can help us here with a 
better understanding. 
   
   



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