benwtrent commented on issue #13798:
URL: https://github.com/apache/lucene/issues/13798#issuecomment-2355911571

   Ah, looking at the `clone` code for merge state @jpountz
   
   ```
       for (int i = 0; i < storedFieldsReaders.length; ++i) {
         if (storedFieldsReaders[i] != null) {
           storedFieldsReaders[i] = storedFieldsReaders[i].getMergeInstance();
         }
         if (termVectorsReaders[i] != null) {
           termVectorsReaders[i] = termVectorsReaders[i].getMergeInstance();
         }
         if (normsProducers[i] != null) {
           normsProducers[i] = normsProducers[i].getMergeInstance();
         }
         if (docValuesProducers[i] != null) {
           docValuesProducers[i] = docValuesProducers[i].getMergeInstance();
         }
         if (fieldsProducers[i] != null) {
           fieldsProducers[i] = fieldsProducers[i].getMergeInstance();
         }
         if (pointsReaders[i] != null) {
           pointsReaders[i] = pointsReaders[i].getMergeInstance();
         }
         if (knnVectorsReaders[i] != null) {
           knnVectorsReaders[i] = knnVectorsReaders[i].getMergeInstance();
         }
       }
   ```
   This assumes `getMergeInstance()` does something. But points simply returns 
`this`. 
   
   I am thinking that sharing a `reader` between threads is always a bad idea.


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