Formal models and scripts: termvectors-compressing

Tools: Python

These are the working models and scripts this part of the hunt used. Some encode the code as it is (a counterexample is the expected result), others a fixed or correct variant; read the header comment of each file. Paths inside them were replaced by placeholders such as $LUCENE (a Lucene checkout) and $WORK.

Findings

• addIndexes(CodecReader) from a reader whose term vectors list a field with zero terms writes a term-vector chunk that the default codec cannot read back, and every later merge that re-encodes the segment closes the IndexWriter (finding LFV-244; repro · finding page)

Files

• tv-writer-accepts-zero-term-field/model/tv_chunk_layout.py (used for LFV-244)

How to run

• Python: python3 <file>.py; scripts that import z3 need the z3-solver package.

Snapshot of 2026-11-03. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.