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/indices/recovery/RecoveryTarget.java
private final AtomicBoolean finished = new AtomicBoolean();
    private final CancellableThreads cancellableThreads;
    
    private volatile long lastAccessTime = System.nanoTime();
    private volatile boolean recoveryMonitorEnabled = true;
    @Nullable 
    private volatile Releasable snapshotFileDownloadsPermit;
    
    private final CountDownLatch closedLatch = new CountDownLatch(1);
    /**
     * Creates a new recovery target object that represents a recovery to the provided shard.
     *
     * @param indexShard                        local shard where we want to recover to
     * @param sourceNode                        source node of the recovery where we recover from
     * @param snapshotFileDownloadsPermit       a permit that allows to download files from a snapshot,
     *                                          limiting the concurrent snapshot file downloads per node
     *                                          preventing the exhaustion of repository resources.
     * @param listener                          called when recovery is completed/failed
     */
    public RecoveryTarget(
        IndexShard indexShard,
        DiscoveryNode sourceNode,
        SnapshotFilesProvider snapshotFilesProvider,
        @Nullable Releasable snapshotFileDownloadsPermit,
        PeerRecoveryTargetService.RecoveryListener listener
    ) {
        this.cancellableThreads = new CancellableThreads();
        this.recoveryId = idGenerator.incrementAndGet();
        this.listener = listener;
        this.logger = Loggers.getLogger(getClass(), indexShard.shardId());