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.
x-pack/plugin/snapshot-based-recoveries/src/internalClusterTest/java/org/elasticsearch/xpack/snapshotbasedrecoveries/recovery/SnapshotBasedIndexRecoveryIT.java
public class SnapshotBasedIndexRecoveryIT extends AbstractSnapshotIntegTestCase {
    @Override
    protected Collection<Class<? extends Plugin>> nodePlugins() {
        return Arrays.asList(
            ConfigurableMockSnapshotBasedRecoveriesPlugin.class,
            TestRepositoryPlugin.class,
            MockTransportService.TestPlugin.class,
            InternalSettingsPlugin.class
        );
    }
    public static class TestRepositoryPlugin extends Plugin implements RepositoryPlugin {
        public static final String FAULTY_TYPE = "faultyrepo";
        public static final String INSTRUMENTED_TYPE = "instrumentedrepo";
        @Override
        public Map<String, Repository.Factory> getRepositories(
            Environment env,
            NamedXContentRegistry namedXContentRegistry,
            ClusterService clusterService,
            BigArrays bigArrays,
            RecoverySettings recoverySettings
        ) {
            return Map.of(
                FAULTY_TYPE,
                metadata -> new FaultyRepository(metadata, env, namedXContentRegistry, clusterService, bigArrays, recoverySettings),
                INSTRUMENTED_TYPE,
                metadata -> new InstrumentedRepo(metadata, env, namedXContentRegistry, clusterService, bigArrays, recoverySettings)
            );
        }
    }
    public static class InstrumentedRepo extends FsRepository {