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
InputStream inputStream = snapshotFilesProvider.getInputStreamForSnapshotFile(
                repository,
                indexId,
                shardId,
                fileInfo,
                this::registerThrottleTime
            )
        ) {
            StoreFileMetadata metadata = fileInfo.metadata();
            int readSnapshotFileBufferSize = snapshotFilesProvider.getReadSnapshotFileBufferSizeForRepo(repository);
            multiFileWriter.writeFile(metadata, readSnapshotFileBufferSize, inputStream);
            listener.onResponse(null);
        } catch (Exception e) {
            logger.debug(() -> format("Unable to recover snapshot file %s from repository %s", fileInfo, repository), e);
            listener.onFailure(e);
        }
    }
    private void registerThrottleTime(long throttleTimeInNanos) {
        state().getIndex().addTargetThrottling(throttleTimeInNanos);
        indexShard.recoveryStats().addThrottleTime(throttleTimeInNanos);
    }
    
    public String getTempNameForFile(String origFile) {
        return multiFileWriter.getTempNameForFile(origFile);
    }
    Path translogLocation() {
        return indexShard().shardPath().resolveTranslog();
    }
}