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The cloner component of a movePrimary(dbName, recipientShard) request issues on the recipientShard a createCollection operation for each untracked / unsplittable collection under dbName as a way to establish the expected catalog metadata on the new primary. Such operations should nevertheless be marked as fromMigrate: true so that the generated op entries are not visible as change events through a change stream targeting one of the namespaces being transferred.

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