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
* @param globalCheckpoint           the global checkpoint associated with the request
     * @param maxSeqNoOfUpdatesOrDeletes the max seq_no of updates (index operations overwrite Lucene) or deletes captured on the primary
     *                                   after this replication request was executed on it (see {@link #getMaxSeqNoOfUpdatesOrDeletes()}
     * @param onPermitAcquired           the listener for permit acquisition
     * @param executorOnDelay            the name of the executor to invoke the listener on if permit acquisition is delayed
     * @param debugInfo                  an extra information that can be useful when tracing an unreleased permit. When assertions are
     *                                   enabled the tracing will capture the supplied object's {@link Object#toString()} value.
     *                                   Otherwise the object isn't used
     */
    public void acquireReplicaOperationPermit(
        final long opPrimaryTerm,
        final long globalCheckpoint,
        final long maxSeqNoOfUpdatesOrDeletes,
        final ActionListener<Releasable> onPermitAcquired,
        final String executorOnDelay,
        final Object debugInfo
    ) {
        innerAcquireReplicaOperationPermit(
            opPrimaryTerm,
            globalCheckpoint,
            maxSeqNoOfUpdatesOrDeletes,
            onPermitAcquired,
            false,
            (listener) -> indexShardOperationPermits.acquire(listener, executorOnDelay, true, debugInfo)
        );
    }
    /**
     * Acquire all replica operation permits whenever the shard is ready for indexing (see
     * {@link #acquireAllPrimaryOperationsPermits(ActionListener, TimeValue)}. If the given primary term is lower than then one in
     * {@link #shardRouting}, the {@link ActionListener#onFailure(Exception)} method of the provided listener is invoked with an