mikemccand commented on PR #12860:
URL: https://github.com/apache/lucene/pull/12860#issuecomment-2243212502

   Whoa, I forgot I had not merged this tool!  To confirm it still works, I ran 
it to check whether `branch_9x`'s 9.10.0 entry matches `main` and it found 
differences!
   
   ```
   raptorlake:trunk[main]$ python3 -u dev-tools/scripts/diff_lucene_changes.py 
branch_9x /l/trunk 9.10.0 "-w"
   NOTE: resolving branch_9x --> 
https://raw.githubusercontent.com/apache/lucene/branch_9x/lucene/CHANGES.txt
   NOTE: resolving /l/trunk --> file:///l/trunk/lucene/CHANGES.txt
   14,17d13
   < * GITHUB#12624, GITHUB#12831: Allow FSTCompiler to stream to any 
DataOutput while building, and
   <   make compile() only return the FSTMetadata. For on-heap (default) use 
case, please use
   <   FST.fromFSTReader(fstMetadata, fstCompiler.getFSTReader()) to create the 
FST. (Anh Dung Bui)
   <
   25,30d20
   < * GITHUB#12829: For indices newly created as of 9.10.0 onwards, 
IndexWriter preserves document blocks indexed via
   <   IndexWriter#addDocuments or IndexWriter#updateDocuments also when index 
sorting is configured. Document blocks are
   <   maintained alongside their parent documents during sort and merge. 
IndexWriterConfig accepts a parent field that is used
   <   to maintain block orders if index sorting is used. Note, this is fully 
optional in Lucene 9.x while will be mandatory for
   <   indices that use document blocks together with index sorting as of 
10.0.0. (Simon Willnauer)
   <
   121a112
   >
   ```
   
   I plan to merge this PR soon, so we have this helpful tool for RMs to 
reconcile the confusingly copied `CHANGES.txt` entries, and then I'll also 
separately reconcile the above diffs.


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