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
flush(indexName);
            }
            String repoName = "repo";
            createRepo(repoName, "fs");
            createSnapshot(repoName, "snap", Collections.singletonList(indexName));
            final String targetNode;
            if (seqNoRecovery) {
                ClusterState clusterState = client().admin().cluster().prepareState().get().getState();
                IndexShardRoutingTable shardRoutingTable = clusterState.routingTable().index(indexName).shard(0);
                String primaryNodeName = clusterState.nodes().resolveNode(shardRoutingTable.primaryShard().currentNodeId()).getName();
                String replicaNodeName = clusterState.nodes()
                    .resolveNode(shardRoutingTable.replicaShards().get(0).currentNodeId())
                    .getName();
                targetNode = dataNodes.stream()
                    .filter(nodeName -> nodeName.equals(primaryNodeName) == false && nodeName.equals(replicaNodeName) == false)
                    .findFirst()
                    .get();
            } else {
                targetNode = internalCluster().startDataOnlyNode();
            }
            MockTransportService targetMockTransportService = (MockTransportService) internalCluster().getInstance(
                TransportService.class,
                targetNode
            );
            CountDownLatch recoverSnapshotFileRequestReceived = new CountDownLatch(1);
            CountDownLatch respondToRecoverSnapshotFile = new CountDownLatch(1);
            AtomicInteger numberOfRecoverSnapshotFileRequestsReceived = new AtomicInteger();
            targetMockTransportService.addRequestHandlingBehavior(
                PeerRecoveryTargetService.Actions.RESTORE_FILE_FROM_SNAPSHOT,
                (handler, request, channel, task) -> {