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
}
    public SearchStats searchStats(String... groups) {
        return searchStats.stats(groups);
    }
    public FieldUsageStats fieldUsageStats(String... fields) {
        return fieldUsageTracker.stats(fields);
    }
    public GetStats getStats() {
        return getService.stats();
    }
    public StoreStats storeStats() {
        try {
            final RecoveryState recoveryState = this.recoveryState;
            if (DiskThresholdDecider.SETTING_IGNORE_DISK_WATERMARKS.get(indexSettings.getSettings())) {
                
                return store.stats(0, size -> 0);
            } else {
                final long bytesStillToRecover = recoveryState == null ? -1L : recoveryState.getIndex().bytesStillToRecover();
                final long reservedBytes = bytesStillToRecover == -1 ? StoreStats.UNKNOWN_RESERVED_BYTES : bytesStillToRecover;
                return store.stats(reservedBytes, LongUnaryOperator.identity());
            }
        } catch (IOException e) {
            failShard("Failing shard because of exception during storeStats", e);
            throw new ElasticsearchException("io exception while building 'store stats'", e);
        }
    }
    public MergeStats mergeStats() {
        final Engine engine = getEngineOrNull();
        if (engine == null) {
            return new MergeStats();