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
);
        this.getService = new ShardGetService(indexSettings, this, mapperService);
        this.shardWarmerService = new ShardIndexWarmerService(shardId, indexSettings);
        this.requestCacheStats = new ShardRequestCache();
        this.shardFieldData = new ShardFieldData();
        this.shardBitsetFilterCache = new ShardBitsetFilterCache(shardId, indexSettings);
        state = IndexShardState.CREATED;
        this.path = path;
        this.circuitBreakerService = circuitBreakerService;
        
        logger.debug("state: [CREATED]");
        this.checkIndexOnStartup = indexSettings.getValue(IndexSettings.INDEX_CHECK_ON_STARTUP);
        this.translogConfig = new TranslogConfig(shardId, shardPath().resolveTranslog(), indexSettings, bigArrays);
        final String aId = shardRouting.allocationId().getId();
        final long primaryTerm = indexSettings.getIndexMetadata().primaryTerm(shardId.id());
        this.pendingPrimaryTerm = primaryTerm;
        this.globalCheckpointListeners = new GlobalCheckpointListeners(shardId, threadPool.scheduler(), logger);
        this.pendingReplicationActions = new PendingReplicationActions(shardId, threadPool);
        this.replicationTracker = new ReplicationTracker(
            shardId,
            aId,
            indexSettings,
            primaryTerm,
            UNASSIGNED_SEQ_NO,
            globalCheckpointListeners::globalCheckpointUpdated,
            threadPool::absoluteTimeInMillis,
            (retentionLeases, listener) -> retentionLeaseSyncer.sync(shardId, aId, getPendingPrimaryTerm(), retentionLeases, listener),
            this::getSafeCommitInfo,
            pendingReplicationActions
        );