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
this.indexShard = indexShard;
        this.sourceNode = sourceNode;
        this.snapshotFilesProvider = snapshotFilesProvider;
        this.snapshotFileDownloadsPermit = snapshotFileDownloadsPermit;
        this.shardId = indexShard.shardId();
        final String tempFilePrefix = RECOVERY_PREFIX + UUIDs.randomBase64UUID() + ".";
        this.multiFileWriter = new MultiFileWriter(
            indexShard.store(),
            indexShard.recoveryState().getIndex(),
            tempFilePrefix,
            logger,
            this::ensureRefCount
        );
        this.store = indexShard.store();
        
        store.incRef();
        indexShard.recoveryStats().incCurrentAsTarget();
    }
    /**
     * Returns a fresh recovery target to retry recovery from the same source node onto the same shard and using the same listener.
     *
     * @return a copy of this recovery target
     */
    public RecoveryTarget retryCopy() {
        
        
        Releasable snapshotFileDownloadsPermitCopy = snapshotFileDownloadsPermit;
        snapshotFileDownloadsPermit = null;
        return new RecoveryTarget(indexShard, sourceNode, snapshotFilesProvider, snapshotFileDownloadsPermitCopy, listener);
    }