mikemccand opened a new issue, #12901:
URL: https://github.com/apache/lucene/issues/12901
### Description
Spinoff from #12895 where we inadvertently introduced read-time exceptions
in `MultiTermQueries` (e.g. `WildcardQuery` `*fo*`) in 9.9.0 when reading
pre-9.9.0 written indices.
Our `TestBackwardsCompatibility` test should have caught this but clearly
did not.
Let's:
1. Make a test revealing #12895
2. Confirm the test (and all other tests) pass when applying the proposed
PR fix #12900
3. Merge the new test case
4. Merget he fix in #12900
Hopefully in that order?
We could simply snapshot the `wikibigall` index into BWC zip files, but,
that's way too massive. Can we instead make a randomized test that indexes
fewer-ish terms and reveals the bug? With "just so" set of terms, the bug
should reproduce with a tiny index. We could maybe iterate to "just so" by
tweaking the set of terms' prefixes until the on-disk file pointers of each
block share the last 6 bits of their respective pointers?
### Gradle command to reproduce
_No response_
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