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
synchronized (engineMutex) {
            try {
                synchronized (mutex) {
                    changeState(IndexShardState.CLOSED, reason);
                }
            } finally {
                final Engine engine = this.currentEngineReference.getAndSet(null);
                try {
                    if (engine != null && flushEngine) {
                        engine.flushAndClose();
                    }
                } finally {
                    
                    
                    IOUtils.close(engine, globalCheckpointListeners, refreshListeners, pendingReplicationActions);
                    indexShardOperationPermits.close();
                }
            }
        }
    }
    public void preRecovery() {
        final IndexShardState currentState = this.state; 
        if (currentState == IndexShardState.CLOSED) {
            throw new IndexShardNotRecoveringException(shardId, currentState);
        }
        assert currentState == IndexShardState.RECOVERING : "expected a recovering shard " + shardId + " but got " + currentState;
        indexEventListener.beforeIndexShardRecovery(this, indexSettings);
    }
    public void postRecovery(String reason) throws IndexShardStartedException, IndexShardRelocatedException, IndexShardClosedException {
        synchronized (postRecoveryMutex) {