After discussion on return type of search index drop/update operations, it was decided that it should be void.

It's inconsistent to return profiling information only when there is nothing else. There are events for that.

• ok is always 1, I suppose there is always an exception in case of error.
• $clusterTime is in the session
• operationTime is typically for profiling. So use MongoDB\Driver\Monitoring\CommandSubscriber for that.

Modify the return type of the following operations to void:

• CreateCollection

• CreateEncryptedCollection

• DropCollection
• DropDatabase

• DropEncryptedCollection

• DropIndexes

• DropSearchIndex (already void)

• ModifyCollection

• RenameCollection

• UpdateSearchIndex (already void)

This is a breaking change for version 2.0