msokolov commented on PR #13910:
URL: https://github.com/apache/lucene/pull/13910#issuecomment-2429428988

   ok something like this:
   
   Dear Lucene user community,
   
   We recently uncovered a backwards compatibility bug that affects indexes 
created with version 9.0 containing KNN vector fields. Versions 9.8 - 9.12 are 
unable to search vectors in such indexes correctly and will return incorrect 
results without raising any error. We think it's likely very few if any of you 
are using 9.0 indexes, but if you are, possible mitigation steps are:
   
   * Upgrade to 10.0 or later, or
   * Do not upgrade past 9.7, or
   * If you must use an affected Lucene version (9.8-9.12) and you have 
9.0-written indexes including KNN vector fields, you must recreate those 
indexes from source with your current Lucene version.  
   


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