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/indices/recovery/RecoveryState.java
* Sets the total number of translog operations to be recovered locally before performing peer recovery
         * @see IndexShard#recoverLocallyUpToGlobalCheckpoint()
         */
        public synchronized void totalLocal(int totalLocal) {
            assert totalLocal >= recovered : totalLocal + " < " + recovered;
            this.totalLocal = totalLocal;
        }
        public synchronized int totalLocal() {
            return totalLocal;
        }
        public synchronized float recoveredPercent() {
            if (total == UNKNOWN) {
                return -1.f;
            }
            if (total == 0) {
                return 100.f;
            }
            return recovered * 100.0f / total;
        }
        @Override
        public synchronized XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
            builder.field(Fields.RECOVERED, recovered);
            builder.field(Fields.TOTAL, total);
            builder.field(Fields.PERCENT, String.format(Locale.ROOT, "%1.1f%%", recoveredPercent()));
            builder.field(Fields.TOTAL_ON_START, totalOnStart);
            builder.humanReadableField(Fields.TOTAL_TIME_IN_MILLIS, Fields.TOTAL_TIME, new TimeValue(time()));
            return builder;
        }
    }
    public static class FileDetail implements ToXContentObject, Writeable {