Document the change of default Similarity in the migration guide

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We switched from ClassicSimilarity to BM25Similarity. I think Lucene did the same, but I might be wrong. In any case, we need to mention this in the migration guide.

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Created September 1, 2021 at 11:21 AM
Updated October 18, 2021 at 8:21 AM
Resolved September 2, 2021 at 3:33 PM