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
return recoveredOps;
                };
                innerOpenEngineAndTranslog(() -> globalCheckpoint);
                getEngine().recoverFromTranslog(translogRecoveryRunner, globalCheckpoint);
                logger.trace("shard locally recovered up to {}", getEngine().getSeqNoStats(globalCheckpoint));
            } finally {
                synchronized (engineMutex) {
                    IOUtils.close(currentEngineReference.getAndSet(null));
                }
            }
        } catch (Exception e) {
            logger.debug(() -> format("failed to recover shard locally up to global checkpoint %s", globalCheckpoint), e);
            return UNASSIGNED_SEQ_NO;
        }
        try {
            
            final Optional<SequenceNumbers.CommitInfo> newSafeCommit = store.findSafeIndexCommit(globalCheckpoint);
            assert newSafeCommit.isPresent() : "no safe commit found after local recovery";
            return newSafeCommit.get().localCheckpoint + 1;
        } catch (Exception e) {
            logger.debug(
                () -> format("failed to find the safe commit after recovering shard locally up to global checkpoint %s", globalCheckpoint),
                e
            );
            return UNASSIGNED_SEQ_NO;
        }
    }
    public void trimOperationOfPreviousPrimaryTerms(long aboveSeqNo) {
        getEngine().trimOperationsFromTranslog(getOperationPrimaryTerm(), aboveSeqNo);
    }