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
private final ShardRequestCache requestCacheStats;
    private final ShardFieldData shardFieldData;
    private final ShardBitsetFilterCache shardBitsetFilterCache;
    private final Object mutex = new Object();
    private final String checkIndexOnStartup;
    private final CodecService codecService;
    private final Engine.Warmer warmer;
    private final SimilarityService similarityService;
    private final TranslogConfig translogConfig;
    private final IndexEventListener indexEventListener;
    private final QueryCachingPolicy cachingPolicy;
    private final Supplier<Sort> indexSortSupplier;
    
    final CircuitBreakerService circuitBreakerService;
    private final SearchOperationListener searchOperationListener;
    private final ShardBulkStats bulkOperationListener;
    private final GlobalCheckpointListeners globalCheckpointListeners;
    private final PendingReplicationActions pendingReplicationActions;
    private final ReplicationTracker replicationTracker;
    private final IndexStorePlugin.SnapshotCommitSupplier snapshotCommitSupplier;
    protected volatile ShardRouting shardRouting;
    protected volatile IndexShardState state;
    
    private final Object postRecoveryMutex = new Object();
    private volatile long pendingPrimaryTerm; 
    private final Object engineMutex = new Object(); 
    private final AtomicReference<Engine> currentEngineReference = new AtomicReference<>();
    final EngineFactory engineFactory;
    private final IndexingOperationListener indexingOperationListeners;
    private final Runnable globalCheckpointSyncer;