I did not see this bug when I added documents to the InstantiatedIndex using addDocument. When I use InstantiatedIndex(IndexReader sourceIndexReader) I'm getting a java.lang.NullPointerException at org.apache.lucene.store.instantiated.InstantiatedIndexReader.norms. No other changes, I removed the overriding of norms methods I had in the subclass so that should not be the issue.
