Fiona - I opened a ticket <https://issues.apache.org/jira/browse/LUCENE-9269> for this. You can find some recommendations there that might help you fix your issue.
- Inconsistent query results in Lucene 8.1.0 Fiona Hasanaj
- Re: Inconsistent query results in Lucene 8.1.0 Michele Palmia
- Re: Inconsistent query results in Lucene 8.1... Michael Sokolov
- Re: Inconsistent query results in Lucene... Michele Palmia
- Re: Inconsistent query results in Lu... Adrien Grand
- Re: Inconsistent query results in Lucene 8.1... Atri Sharma
- RE: Inconsistent query results in Lucene 8.1... Staley, Phil R - DCF
- Re: Inconsistent query results in Lucene... David Smiley
