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
indexShard().sync();
            
            indexShard().afterWriteOperation();
            return indexShard().getLocalCheckpoint();
        });
    }
    @Override
    public void receiveFileInfo(
        List<String> phase1FileNames,
        List<Long> phase1FileSizes,
        List<String> phase1ExistingFileNames,
        List<Long> phase1ExistingFileSizes,
        int totalTranslogOps,
        ActionListener<Void> listener
    ) {
        ActionListener.completeWith(listener, () -> {
            multiFileWriter.deleteTempFiles();
            indexShard.resetRecoveryStage();
            indexShard.prepareForIndexRecovery();
            final RecoveryState.Index index = state().getIndex();
            for (int i = 0; i < phase1ExistingFileNames.size(); i++) {
                index.addFileDetail(phase1ExistingFileNames.get(i), phase1ExistingFileSizes.get(i), true);
            }
            for (int i = 0; i < phase1FileNames.size(); i++) {
                index.addFileDetail(phase1FileNames.get(i), phase1FileSizes.get(i), false);
            }
            index.setFileDetailsComplete();
            state().getTranslog().totalOperations(totalTranslogOps);
            state().getTranslog().totalOperationsOnStart(totalTranslogOps);
            return null;