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
assertThat(repository.totalBytesRead.get(), is(equalTo(0L)));
        assertDocumentsAreEqual(indexName, numDocs + docsIndexedAfterSnapshot);
    }
    @TestLogging(reason = "testing logging on cancellation", value = "org.elasticsearch.indices.recovery.RecoverySourceHandler:DEBUG")
    public void testRecoveryIsCancelledAfterDeletingTheIndex() throws Exception {
        updateSetting(INDICES_RECOVERY_MAX_CONCURRENT_SNAPSHOT_FILE_DOWNLOADS.getKey(), "1");
        try {
            boolean seqNoRecovery = randomBoolean();
            String indexName = randomAlphaOfLength(10).toLowerCase(Locale.ROOT);
            final Settings.Builder indexSettings = Settings.builder()
                .put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, 1)
                .put(MergePolicyConfig.INDEX_MERGE_ENABLED, false)
                .put(IndexService.GLOBAL_CHECKPOINT_SYNC_INTERVAL_SETTING.getKey(), "1s");
            final List<String> dataNodes;
            if (seqNoRecovery) {
                dataNodes = internalCluster().startDataOnlyNodes(3);
                indexSettings.put("index.routing.allocation.include._name", String.join(",", dataNodes))
                    .put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 1);
            } else {
                dataNodes = internalCluster().startDataOnlyNodes(1);
                indexSettings.put("index.routing.allocation.require._name", dataNodes.get(0))
                    .put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 0);
            }
            createIndex(indexName, indexSettings.build());
            ensureGreen(indexName);
            int numDocs = randomIntBetween(300, 1000);
            indexDocs(indexName, numDocs, numDocs);
            if (seqNoRecovery) {