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Author:
{'name': 'Ben Shteinfeld', 'email': 'ben.shteinfeld@mongodb.com', 'username': 'bshteinfeld'}
Message: SERVER-79991 Fallback to classic when we encounter a collection with a
hashed shard key.
SERVER-78253 changed the behavior of dropIndexes() to drop hashed
indexes which are backing hashed shard keys. The fallback mechanism was
assuming that a hashed shard key will always have a backing hashed
index; now this assumption is no longer valid. This change explicitly
falls back when encountering a hashed shard key to account for cases
where the backing index is dropped.
Branch: master
https://github.com/mongodb/mongo/commit/e081fbfffed44b1db793ec412264d89be91223e1
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