Null Pointer exception after upgrading lucene index from 6.1 to 7.2

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Null Pointer exception after upgrading lucene index from 6.1 to 7.2

WebsterHomer
We ran the org.apache.lucene.index.IndexUpgrader as part of upgrading from
6.1 to 7.2.0

After the upgrade, one of our collections threw a NullPointerException on a
query of *:*

We didn't observe errors in the logs. All of our other collections appear
to be fine.

Re-indexing the collection seems to have fixed the issue.

So be very careful with the upgrade tool it is not robust

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