2017-02-28 14:25:40 ERROR juju.worker.migrationmaster.40fd7e worker.go:284 model data transfer failed, model export failed: failed to read status history collection: Executor error during find command: OperationFailed: Sort operation used more than the maximum 33554432 bytes of RAM. Add an index, or specify a smaller limit.
2017-02-28 14:25:40 WARNING juju.worker.migrationmaster.40fd7e worker.go:592 failed to remove model from target controller, model not found (not found)