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
throw new AssertionError("Unknown result type [" + result.getResultType() + "]");
                }
                opsRecovered++;
                onOperationRecovered.run();
            } catch (Exception e) {
                
                if (origin == Engine.Operation.Origin.LOCAL_TRANSLOG_RECOVERY && ExceptionsHelper.status(e) == RestStatus.BAD_REQUEST) {
                    
                    logger.info("ignoring recovery of a corrupt translog entry", e);
                } else {
                    throw ExceptionsHelper.convertToRuntime(e);
                }
            }
        }
        return opsRecovered;
    }
    private void loadGlobalCheckpointToReplicationTracker() throws IOException {
        
        
        
        final String translogUUID = store.readLastCommittedSegmentsInfo().getUserData().get(Translog.TRANSLOG_UUID_KEY);
        final long globalCheckpoint = Translog.readGlobalCheckpoint(translogConfig.getTranslogPath(), translogUUID);
        replicationTracker.updateGlobalCheckpointOnReplica(globalCheckpoint, "read from translog checkpoint");
    }
    /**
     * opens the engine on top of the existing lucene engine and translog.
     * Operations from the translog will be replayed to bring lucene up to date.
     **/
    public void openEngineAndRecoverFromTranslog() throws IOException {
        recoveryState.validateCurrentStage(RecoveryState.Stage.INDEX);