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
Runnable getGlobalCheckpointSyncer() {
        return globalCheckpointSyncer;
    }
    private final RetentionLeaseSyncer retentionLeaseSyncer;
    @Nullable
    private volatile RecoveryState recoveryState;
    private final RecoveryStats recoveryStats = new RecoveryStats();
    private final MeanMetric refreshMetric = new MeanMetric();
    private final MeanMetric externalRefreshMetric = new MeanMetric();
    private final MeanMetric flushMetric = new MeanMetric();
    private final CounterMetric periodicFlushMetric = new CounterMetric();
    private final ShardEventListener shardEventListener = new ShardEventListener();
    private final ShardPath path;
    private final IndexShardOperationPermits indexShardOperationPermits;
    private static final EnumSet<IndexShardState> readAllowedStates = EnumSet.of(IndexShardState.STARTED, IndexShardState.POST_RECOVERY);
    
    
    
    
    
    
    private static final EnumSet<IndexShardState> writeAllowedStates = EnumSet.of(
        IndexShardState.RECOVERING,
        IndexShardState.POST_RECOVERY,
        IndexShardState.STARTED
    );
    private final CheckedFunction<DirectoryReader, DirectoryReader, IOException> readerWrapper;
    /**
     * True if this shard is still indexing (recently) and false if we've been idle for long enough (as periodically checked by {@link
     * IndexingMemoryController}).