We saw a case where the recovery stats reported `recovered_bytes` greater than `length_in_bytes` for one file:

```
GET /_recovery?detailed

200 OK
...
{
  "name": "_buk.fdt",
  "length_in_bytes": 26891307173,
  "reused": false,
  "recovered_in_bytes": 35324928266,
  "recovered_from_snapshot_in_bytes": 8433621093
}
...
```

NB `35324928266 == 26891307173 + 8433621093`

This causes Elasticsearch to compute a negative value for the reserved space on the target node of this recovery, which prevents stats APIs from working. This appears to be caused by a network-level failure which triggers a retry without first cancelling an ongoing download of a different file with the same name from the snapshot repository.

---

### Workaround

Restart the target node to clear these stats.
server/src/main/java/org/elasticsearch/index/shard/IndexShard.java
}
                    throw e;
                }
                break;
            default:
                throw new IllegalArgumentException("Unknown recovery source " + recoveryState.getRecoverySource());
        }
    }
    private void executeRecovery(
        String reason,
        RecoveryState recoveryState,
        PeerRecoveryTargetService.RecoveryListener recoveryListener,
        CheckedConsumer<ActionListener<Boolean>, Exception> action
    ) {
        markAsRecovering(reason, recoveryState); 
        threadPool.generic().execute(ActionRunnable.wrap(ActionListener.wrap(r -> {
            if (r) {
                recoveryListener.onRecoveryDone(recoveryState, getTimestampRange());
            }
        }, e -> recoveryListener.onRecoveryFailure(recoveryState, new RecoveryFailedException(recoveryState, null, e), true)), action));
    }
    /**
     * Returns whether the shard is a relocated primary, i.e. not in charge anymore of replicating changes (see {@link ReplicationTracker}).
     */
    public boolean isRelocatedPrimary() {
        assert shardRouting.primary() : "only call isRelocatedPrimary on primary shard";
        return replicationTracker.isRelocated();
    }
    public RetentionLease addPeerRecoveryRetentionLease(
        String nodeId,