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
numShards = -1;
                    requiredShards = Collections.emptySet();
                }
                if (numShards == startedShards.size()) {
                    assert requiredShards.isEmpty() == false;
                    executeRecovery(
                        "from local shards",
                        recoveryState,
                        recoveryListener,
                        l -> recoverFromLocalShards(
                            mappingUpdateConsumer,
                            startedShards.stream().filter((s) -> requiredShards.contains(s.shardId())).toList(),
                            l
                        )
                    );
                } else {
                    final RuntimeException e;
                    if (numShards == -1) {
                        e = new IndexNotFoundException(resizeSourceIndex);
                    } else {
                        e = new IllegalStateException(
                            "not all required shards of index "
                                + resizeSourceIndex
                                + " are started yet, expected "
                                + numShards
                                + " found "
                                + startedShards.size()
                                + " can't recover shard "
                                + shardId()
                        );