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 getEngine().getLastSyncedGlobalCheckpoint();
    }
    /**
     * Get the local knowledge of the global checkpoints for all in-sync allocation IDs.
     *
     * @return a map from allocation ID to the local knowledge of the global checkpoint for that allocation ID
     */
    public Map<String, Long> getInSyncGlobalCheckpoints() {
        assert assertPrimaryMode();
        verifyNotClosed();
        return replicationTracker.getInSyncGlobalCheckpoints();
    }
    /**
     * Syncs the global checkpoint to the replicas if the global checkpoint on at least one replica is behind the global checkpoint on the
     * primary.
     */
    public void maybeSyncGlobalCheckpoint(final String reason) {
        verifyNotClosed();
        assert shardRouting.primary() : "only call maybeSyncGlobalCheckpoint on primary shard";
        if (replicationTracker.isPrimaryMode() == false) {
            return;
        }
        assert assertPrimaryMode();
        
        final SeqNoStats stats = getEngine().getSeqNoStats(replicationTracker.getGlobalCheckpoint());
        final boolean asyncDurability = indexSettings().getTranslogDurability() == Translog.Durability.ASYNC;
        if (stats.getMaxSeqNo() == stats.getGlobalCheckpoint() || asyncDurability) {
            final var trackedGlobalCheckpointsNeedSync = replicationTracker.trackedGlobalCheckpointsNeedSync();