bugfix for wrong timeunit in updating lastLedgerCreationInitiationTim…

…estamp (#10049)

Co-authored-by: wuzhanpeng <wuzhanpeng@bigo.sg>
(cherry picked from commit 1b8da92)

managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java

@@ -1472,7 +1472,7 @@ synchronized void ledgerClosed(final LedgerHandle lh) {
 
     synchronized void createLedgerAfterClosed() {
         STATE_UPDATER.set(this, State.CreatingLedger);
-        this.lastLedgerCreationInitiationTimestamp = System.nanoTime();
+        this.lastLedgerCreationInitiationTimestamp = System.currentTimeMillis();
         mbean.startDataLedgerCreateOp();
         asyncCreateLedger(bookKeeper, config, digestType, this, Collections.emptyMap());
     }