Open MLPendingAckStore managedLedger failed

**Describe the bug**
Pulsar v2.8.0
Cluster Info:
1、3 zookeepers
2、3 bookies
3、1 broker

Step:
1、set transactionCoordinatorEnabled=true in broker.conf
2、Consumer Code:
```
ConsumerBuilder consumerBuilder = getClient().newConsumer(Schema.STRING);
List topics = new ArrayList<>();
topics.add("persistent://public/default/test-string112");
topics.add("persistent://public/default/test-string113");
consumerBuilder.topics(topics)
.subscriptionName("consumerSych")
.subscriptionType(SubscriptionType.Shared)
.subscriptionInitialPosition(SubscriptionInitialPosition.Earliest);

Consumer consumer = consumerBuilder.subscribe();
int count = 0;
while (true) {
Message msg = consumer.receive();
consumer.acknowledge(msg);
System.out.println("message:" + msg.getMessageId().toString() + ",curTime:" + System.currentTimeMillis());
}
```

3、Start Consumer
Consumer log:
```
2021-08-25 14:28:01.800 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string113-partition-0][consumerSych] Failed to subscribe to topic on /172.32.149.123:16650
2021-08-25 14:28:01.801 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ClientCnx - [id: 0xdfab9ac0, L:/172.32.147.245:11860 - R:/172.32.149.123:16650] 8 request timedout after ms 30000
2021-08-25 14:28:01.801 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string113-partition-1][consumerSych] Failed to subscribe to topic on /172.32.149.123:16650
2021-08-25 14:28:01.802 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ClientCnx - [id: 0xdfab9ac0, L:/172.32.147.245:11860 - R:/172.32.149.123:16650] 9 request timedout after ms 30000
2021-08-25 14:28:01.802 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string113-partition-2][consumerSych] Failed to subscribe to topic on /172.32.149.123:16650
2021-08-25 14:28:01.802 [pulsar-client-io-1-1] WARN o.a.pulsar.client.impl.MultiTopicsConsumerImpl - [MultiTopicsConsumer-f65a1] Failed to subscribe for topic [persistent://public/default/test-string113] in topics consumer org.apache.pulsar.client.api.PulsarClientException$TimeoutException: 8 request timedout after ms 30000
2021-08-25 14:28:01.804 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ClientCnx - [id: 0xdfab9ac0, L:/172.32.147.245:11860 - R:/172.32.149.123:16650] 10 request timedout after ms 30000
2021-08-25 14:28:01.804 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string112-partition-1][consumerSych] Failed to subscribe to topic on /172.32.149.123:16650
2021-08-25 14:28:01.804 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ClientCnx - [id: 0xdfab9ac0, L:/172.32.147.245:11860 - R:/172.32.149.123:16650] 11 request timedout after ms 30000
2021-08-25 14:28:01.804 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string112-partition-0][consumerSych] Failed to subscribe to topic on /172.32.149.123:16650
2021-08-25 14:28:01.805 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ClientCnx - [id: 0xdfab9ac0, L:/172.32.147.245:11860 - R:/172.32.149.123:16650] 12 request timedout after ms 30000
2021-08-25 14:28:01.805 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string112-partition-2][consumerSych] Failed to subscribe to topic on /172.32.149.123:16650
2021-08-25 14:28:01.805 [pulsar-client-io-1-1] WARN o.a.pulsar.client.impl.MultiTopicsConsumerImpl - [MultiTopicsConsumer-f65a1] Failed to subscribe for topic [persistent://public/default/test-string112] in topics consumer org.apache.pulsar.client.api.PulsarClientException$TimeoutException: 12 request timedout after ms 30000
2021-08-25 14:28:01.806 [pulsar-client-io-1-1] WARN org.apache.pulsar.client.impl.ClientCnx - [id: 0xdfab9ac0, L:/172.32.147.245:11860 - R:/172.32.149.123:16650] 13 request timedout after ms 30000
2021-08-25 14:28:01.806 [pulsar-external-listener-3-1] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string113-partition-2] [consumerSych] Closed Consumer (not connected)
2021-08-25 14:28:01.807 [pulsar-external-listener-3-1] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string113-partition-1] [consumerSych] Closed Consumer (not connected)
2021-08-25 14:28:01.808 [pulsar-external-listener-3-1] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string113-partition-0] [consumerSych] Closed Consumer (not connected)
2021-08-25 14:28:01.808 [pulsar-external-listener-3-1] WARN o.a.pulsar.client.impl.MultiTopicsConsumerImpl - [MultiTopicsConsumer-f65a1] Failed to subscribe for topic [persistent://public/default/test-string113] in topics consumer, subscribe error: org.apache.pulsar.client.api.PulsarClientException$TimeoutException: 8 request timedout after ms 30000
2021-08-25 14:28:01.808 [pulsar-external-listener-3-1] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string112-partition-1] [consumerSych] Closed Consumer (not connected)
2021-08-25 14:28:01.808 [pulsar-external-listener-3-1] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string112-partition-2] [consumerSych] Closed Consumer (not connected)
2021-08-25 14:28:01.808 [pulsar-external-listener-3-1] INFO org.apache.pulsar.client.impl.ConsumerImpl - [persistent://public/default/test-string112-partition-0] [consumerSych] Closed Consumer (not connected)
2021-08-25 14:28:01.809 [pulsar-external-listener-3-1] WARN o.a.pulsar.client.impl.MultiTopicsConsumerImpl - [MultiTopicsConsumer-f65a1] Failed to subscribe for topic [persistent://public/default/test-string112] in topics consumer, subscribe error: org.apache.pulsar.client.api.PulsarClientException$TimeoutException: 12 request timedout after ms 30000
2021-08-25 14:28:01.809 [pulsar-external-listener-3-1] WARN o.a.pulsar.client.impl.MultiTopicsConsumerImpl - [MultiTopicsConsumer-f65a1] Failed to subscribe topics: org.apache.pulsar.client.api.PulsarClientException$TimeoutException: 12 request timedout after ms 30000, closing consumer
2021-08-25 14:28:01.809 [pulsar-external-listener-3-1] INFO o.a.pulsar.client.impl.MultiTopicsConsumerImpl - [MultiTopicsConsumer-f65a1] [consumerSych] Closed Topics Consumer
org.apache.pulsar.client.api.PulsarClientException$TimeoutException: 12 request timedout after ms 30000

Process finished with exit code -1

```

4、vi broker.log:

```
14:27:26.172 [bookkeeper-ml-scheduler-OrderedScheduler-2-0] WARN org.apache.pulsar.common.naming.TopicName - Could not get the partition index from the topic persistent://public/default/test-string112-partition-0-consumerSych__transaction_pending_ack
14:27:26.173 [bookkeeper-ml-scheduler-OrderedScheduler-2-0] INFO org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl - Opening managed ledger public/default/persistent/test-string112-partition-0-consumerSych__transaction_pending_ack
14:27:26.181 [bookkeeper-ml-scheduler-OrderedScheduler-4-0] INFO org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl - [public/default/persistent/test-string112-partition-0-consumerSych__transaction_pending_ack] Closing managed ledger
14:27:26.181 [bookkeeper-ml-scheduler-OrderedScheduler-4-0] ERROR org.apache.pulsar.broker.transaction.pendingack.impl.MLPendingAckStoreProvider - Open MLPendingAckStore managedLedger failed.
org.apache.bookkeeper.mledger.ManagedLedgerException$ManagedLedgerNotFoundException: org.apache.bookkeeper.mledger.ManagedLedgerException$MetadataNotFoundException: Managed ledger not found
Caused by: org.apache.bookkeeper.mledger.ManagedLedgerException$MetadataNotFoundException: Managed ledger not found
14:27:26.181 [bookkeeper-ml-scheduler-OrderedScheduler-4-0] ERROR org.apache.pulsar.broker.transaction.pendingack.impl.PendingAckHandleImpl - PendingAckHandleImpl init fail! TopicName : persistent://public/default/test-string112-partition-0, SubName: consumerSych
java.util.concurrent.CompletionException: org.apache.bookkeeper.mledger.ManagedLedgerException$ManagedLedgerNotFoundException: org.apache.bookkeeper.mledger.ManagedLedgerException$MetadataNotFoundException: Managed ledger not found
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:661) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:646) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990) ~[?:1.8.0_251]
at org.apache.pulsar.broker.transaction.pendingack.impl.MLPendingAckStoreProvider$1.openLedgerFailed(MLPendingAckStoreProvider.java:81) ~[org.apache.pulsar-pulsar-broker-2.8.0.jar:2.8.0]
at org.apache.bookkeeper.mledger.impl.ManagedLedgerFactoryImpl.lambda$asyncOpen$8(ManagedLedgerFactoryImpl.java:402) ~[org.apache.pulsar-managed-ledger-2.8.0.jar:2.8.0]
at java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:884) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:866) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488) ~[?:1.8.0_251]
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990) ~[?:1.8.0_251]
at org.apache.bookkeeper.mledger.impl.ManagedLedgerFactoryImpl$2.initializeFailed(ManagedLedgerFactoryImpl.java:397) ~[org.apache.pulsar-managed-ledger-2.8.0.jar:2.8.0]
at org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl$1.operationFailed(ManagedLedgerImpl.java:396) ~[org.apache.pulsar-managed-ledger-2.8.0.jar:2.8.0]
at org.apache.bookkeeper.mledger.impl.MetaStoreImpl.lambda$getManagedLedgerInfo$2(MetaStoreImpl.java:87) ~[org.apache.pulsar-managed-ledger-2.8.0.jar:2.8.0]
at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:670) [?:1.8.0_251]
at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:646) [?:1.8.0_251]
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456) [?:1.8.0_251]
at org.apache.bookkeeper.common.util.OrderedExecutor$TimedRunnable.run(OrderedExecutor.java:203) [org.apache.bookkeeper-bookkeeper-common-4.14.1.jar:4.14.1]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_251]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_251]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_251]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_251]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_251]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_251]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [io.netty-netty-common-4.1.63.Final.jar:4.1.63.Final]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_251]
Caused by: org.apache.bookkeeper.mledger.ManagedLedgerException$ManagedLedgerNotFoundException: org.apache.bookkeeper.mledger.ManagedLedgerException$MetadataNotFoundException: Managed ledger not found
Caused by: org.apache.bookkeeper.mledger.ManagedLedgerException$MetadataNotFoundException: Managed ledger not found
14:27:38.009 [pulsar-load-manager-1-1] INFO org.apache.pulsar.broker.loadbalance.impl.ModularLoadManagerImpl - Only 1 broker available: no load shedding will be performed

```

Start with the broker.log stack trace and inspect MLPendingAckStoreProvider.java around line 81, then follow PendingAckHandleImpl and ManagedLedgerFactoryImpl. Reproduce the v2.8.0 setup with transactionCoordinatorEnabled=true and the multi-topic shared consumer. Done means subscription no longer times out while opening the pending-ack managed ledger.

Written by the indexing model from the issue text.