The status of the topic is not shown according to the return value of the RESTAPI


enum State {
Uninitialized, // Cursor is being initialized
NoLedger, // There is no metadata ledger open for writing
Open, // Metadata ledger is ready
SwitchingLedger, // The metadata ledger is being switched
Closing, // The managed cursor is closing
Closed // The managed cursor has been closed
}

Ledger has these states。