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
fieldUsageTracker = new ShardFieldUsageTracker();
        shardCreationTime = threadPool.absoluteTimeInMillis();
        
        
        if (IndexModule.INDEX_QUERY_CACHE_EVERYTHING_SETTING.get(settings)) {
            cachingPolicy = TrivialQueryCachingPolicy.ALWAYS;
        } else {
            cachingPolicy = new UsageTrackingQueryCachingPolicy();
        }
        indexShardOperationPermits = new IndexShardOperationPermits(shardId, threadPool);
        readerWrapper = indexReaderWrapper;
        refreshListeners = buildRefreshListeners();
        lastSearcherAccess.set(threadPool.relativeTimeInMillis());
        persistMetadata(path, indexSettings, shardRouting, null, logger);
        this.useRetentionLeasesInPeerRecovery = replicationTracker.hasAllPeerRecoveryRetentionLeases();
        this.refreshPendingLocationListener = new RefreshPendingLocationListener();
        this.isDataStreamIndex = mapperService == null ? false : mapperService.mappingLookup().isDataStreamTimestampFieldEnabled();
    }
    public ThreadPool getThreadPool() {
        return this.threadPool;
    }
    public Store store() {
        return this.store;
    }
    /**
     * Return the sort order of this index, or null if the index has no sort.
     */
    public Sort getIndexSort() {
        return indexSortSupplier.get();
    }