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
Settings.builder()
                        .put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, 1)
                        .put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 0)
                        .put(MergePolicyConfig.INDEX_MERGE_ENABLED, false)
                        .put(IndexService.GLOBAL_CHECKPOINT_SYNC_INTERVAL_SETTING.getKey(), "1s")
                        .put("index.routing.allocation.require._name", dataNodes.get(0))
                        .put(SETTING_ALLOCATION_MAX_RETRY.getKey(), 0)
                        .build()
                );
                indices.add(indexName);
            }
            String repoName = "repo";
            createRepo(repoName, "fs");
            for (String indexName : indices) {
                int numDocs = randomIntBetween(300, 1000);
                indexDocs(indexName, numDocs, numDocs);
                createSnapshot(repoName, "snap-" + indexName, Collections.singletonList(indexName));
            }
            String sourceNode = dataNodes.get(0);
            String targetNode = dataNodes.get(1);
            MockTransportService targetMockTransportService = (MockTransportService) internalCluster().getInstance(
                TransportService.class,
                targetNode
            );
            List<RecoverySnapshotFileRequest> recoverySnapshotFileRequests = Collections.synchronizedList(new ArrayList<>());
            CountDownLatch recoverSnapshotFileRequestReceived = new CountDownLatch(1);
            CountDownLatch respondToRecoverSnapshotFile = new CountDownLatch(1);
            targetMockTransportService.addRequestHandlingBehavior(
                PeerRecoveryTargetService.Actions.RESTORE_FILE_FROM_SNAPSHOT,
                (handler, request, channel, task) -> {