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
import org.elasticsearch.index.mapper.SourceToParse;
import org.elasticsearch.index.mapper.Uid;
import org.elasticsearch.index.merge.MergeStats;
import org.elasticsearch.index.recovery.RecoveryStats;
import org.elasticsearch.index.refresh.RefreshStats;
import org.elasticsearch.index.search.stats.FieldUsageStats;
import org.elasticsearch.index.search.stats.SearchStats;
import org.elasticsearch.index.search.stats.ShardFieldUsageTracker;
import org.elasticsearch.index.search.stats.ShardSearchStats;
import org.elasticsearch.index.seqno.ReplicationTracker;
import org.elasticsearch.index.seqno.RetentionLease;
import org.elasticsearch.index.seqno.RetentionLeaseStats;
import org.elasticsearch.index.seqno.RetentionLeaseSyncer;
import org.elasticsearch.index.seqno.RetentionLeases;
import org.elasticsearch.index.seqno.SeqNoStats;
import org.elasticsearch.index.seqno.SequenceNumbers;
import org.elasticsearch.index.shard.PrimaryReplicaSyncer.ResyncTask;
import org.elasticsearch.index.similarity.SimilarityService;
import org.elasticsearch.index.store.Store;
import org.elasticsearch.index.store.Store.MetadataSnapshot;
import org.elasticsearch.index.store.StoreFileMetadata;
import org.elasticsearch.index.store.StoreStats;
import org.elasticsearch.index.translog.Translog;
import org.elasticsearch.index.translog.TranslogConfig;
import org.elasticsearch.index.translog.TranslogStats;
import org.elasticsearch.index.warmer.ShardIndexWarmerService;
import org.elasticsearch.index.warmer.WarmerStats;
import org.elasticsearch.indices.IndexingMemoryController;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.indices.breaker.CircuitBreakerService;