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
* @throws java.io.FileNotFoundException                      if one or more files referenced by a commit are not present.
     * @throws java.nio.file.NoSuchFileException                  if one or more files referenced by a commit are not present.
     */
    public Store.MetadataSnapshot snapshotStoreMetadata() throws IOException {
        assert Thread.holdsLock(mutex) == false : "snapshotting store metadata under mutex";
        Engine.IndexCommitRef indexCommit = null;
        store.incRef();
        try {
            synchronized (engineMutex) {
                
                
                final Engine engine = getEngineOrNull();
                if (engine != null) {
                    indexCommit = engine.acquireLastIndexCommit(false);
                }
                if (indexCommit == null) {
                    return store.getMetadata(null, true);
                }
            }
            return store.getMetadata(indexCommit.getIndexCommit());
        } finally {
            store.decRef();
            IOUtils.close(indexCommit);
        }
    }
    /**
     * Fails the shard and marks the shard store as corrupted if
     * <code>e</code> is caused by index corruption
     */
    public void failShard(String reason, @Nullable Exception e) {