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
Level.DEBUG,
                        "cancelled while recovering file [*] from snapshot"
                    )
                );
                mockLogAppender.addExpectation(
                    new MockLogAppender.UnseenEventExpectation(
                        "expected no WARN logs",
                        RecoverySourceHandler.class.getName(),
                        Level.WARN,
                        "*"
                    )
                );
                assertAcked(client().admin().indices().prepareDelete(indexName).get());
                assertBusy(mockLogAppender::assertAllExpectationsMatched);
            } finally {
                Loggers.removeAppender(recoverySourceHandlerLogger, mockLogAppender);
                mockLogAppender.stop();
            }
            respondToRecoverSnapshotFile.countDown();
            assertThat(indexExists(indexName), is(equalTo(false)));
        } finally {
            updateSetting(INDICES_RECOVERY_MAX_CONCURRENT_SNAPSHOT_FILE_DOWNLOADS.getKey(), null);
        }
    }
    public void testRecoveryAfterRestoreUsesSnapshots() throws Exception {
        String indexName = randomAlphaOfLength(10).toLowerCase(Locale.ROOT);
        createIndex(
            indexName,
            Settings.builder()
                .put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, 1)