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.
x-pack/plugin/snapshot-based-recoveries/src/internalClusterTest/java/org/elasticsearch/xpack/snapshotbasedrecoveries/recovery/SnapshotBasedIndexRecoveryIT.java
.setSettings(Settings.builder().put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 1))
        );
        boolean waitForSnapshotDownloadToStart = randomBoolean();
        if (waitForSnapshotDownloadToStart) {
            
            assertBusy(() -> {
                RecoveryState recoveryState = getLatestPeerRecoveryStateForShard(indexName, 0);
                assertThat(recoveryState.getIndex().recoveredBytes(), greaterThan(0L));
            });
        }
        
        assertBusy(() -> {
            if (randomBoolean()) {
                int moreDocs = between(1, 5);
                indexDocs(indexName, numDocs.getAndAdd(moreDocs), moreDocs);
            }
            RecoveryState recoveryState = getLatestPeerRecoveryStateForShard(indexName, 0);
            assertThat(recoveryState.getStage(), equalTo(RecoveryState.Stage.DONE));
        });
        ensureGreen(indexName);
        if (waitForSnapshotDownloadToStart) {
            
            RecoveryState recoveryState = getLatestPeerRecoveryStateForShard(indexName, 0);
            assertThat(recoveryState.getIndex().recoveredFromSnapshotBytes(), equalTo(snapshotSizeForIndex));
        }
        assertDocumentsAreEqual(indexName, numDocs.get());
    }
    public void testSeqNoBasedRecoveryIsUsedAfterPrimaryFailOver() throws Exception {
        List<String> dataNodes = internalCluster().startDataOnlyNodes(3);
        String indexName = randomAlphaOfLength(10).toLowerCase(Locale.ROOT);