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
DirectoryReader reader = readerWrapper.apply(
            new FieldUsageTrackingDirectoryReader(nonClosingReaderWrapper, fieldUsageStatsTrackingSession)
        );
        if (reader.getReaderCacheHelper() != elasticsearchDirectoryReader.getReaderCacheHelper()) {
            throw new IllegalStateException(
                "wrapped directory reader doesn't delegate IndexReader#getCoreCacheKey,"
                    + " wrappers must override this method and delegate to the original readers core cache key. Wrapped readers can't be "
                    + "used as cache keys since their are used only per request which would lead to subtle bugs"
            );
        }
        if (ElasticsearchDirectoryReader.getElasticsearchDirectoryReader(reader) != elasticsearchDirectoryReader) {
            
            throw new IllegalStateException("wrapped directory reader hides actual ElasticsearchDirectoryReader but shouldn't");
        }
        
        
        return new Engine.Searcher(
            engineSearcher.source(),
            reader,
            engineSearcher.getSimilarity(),
            engineSearcher.getQueryCache(),
            engineSearcher.getQueryCachingPolicy(),
            () -> IOUtils.close(
                reader, 
                engineSearcher, 
                fieldUsageStatsTrackingSession
            )
        ); 
    }
    private static final class NonClosingReaderWrapper extends FilterDirectoryReader {