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
* A replica shard also calls this method to bootstrap the max_seq_no_of_updates marker with the value that it received from
     * the primary in peer-recovery, before it replays remote translog operations from the primary. The receiving value is at least
     * as high as the max_seq_no_of_updates on the primary was when any of these operations were processed on it.
     * <p>
     * These transfers guarantee that every index/delete operation when executing on a replica engine will observe this marker a value
     * which is at least the value of the max_seq_no_of_updates marker on the primary after that operation was executed on the primary.
     *
     * @see #acquireReplicaOperationPermit(long, long, long, ActionListener, String, Object)
     * @see RecoveryTarget#indexTranslogOperations(List, int, long, long, RetentionLeases, long, ActionListener)
     */
    public void advanceMaxSeqNoOfUpdatesOrDeletes(long seqNo) {
        getEngine().advanceMaxSeqNoOfUpdatesOrDeletes(seqNo);
    }
    /**
     * Performs the pre-closing checks on the {@link IndexShard}.
     *
     * @throws IllegalStateException if the sanity checks failed
     */
    public void verifyShardBeforeIndexClosing() throws IllegalStateException {
        getEngine().verifyEngineBeforeIndexClosing();
    }
    RetentionLeaseSyncer getRetentionLeaseSyncer() {
        return retentionLeaseSyncer;
    }
    @Override
    public String toString() {
        return "IndexShard(shardRouting=" + shardRouting + ")";
    }
}