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/indices/recovery/MultiFileWriter.java
public IndexOutput removeOpenIndexOutputs(String name) {
        ensureOpen.run();
        return openIndexOutputs.remove(name);
    }
    /**
     * Creates an {@link IndexOutput} for the given file name. Note that the
     * IndexOutput actually point at a temporary file.
     * <p>
     * Note: You can use {@link #getOpenIndexOutput(String)} with the same filename to retrieve the same IndexOutput
     * at a later stage
     */
    public IndexOutput openAndPutIndexOutput(String fileName, StoreFileMetadata metadata, Store store) throws IOException {
        ensureOpen.run();
        String tempFileName = getTempNameForFile(fileName);
        if (tempFileNames.containsKey(tempFileName)) {
            throw new IllegalStateException("output for file [" + fileName + "] has already been created");
        }
        
        tempFileNames.put(tempFileName, fileName);
        IndexOutput indexOutput = store.createVerifyingOutput(tempFileName, metadata, IOContext.DEFAULT);
        openIndexOutputs.put(fileName, indexOutput);
        return indexOutput;
    }
    private void innerWriteFileChunk(StoreFileMetadata fileMetadata, long position, BytesReference content, boolean lastChunk)
        throws IOException {
        final String name = fileMetadata.name();
        IndexOutput indexOutput;
        if (position == 0) {
            indexOutput = openAndPutIndexOutput(name, fileMetadata, store);
        } else {