`pysolr.extract` returns dict with empty values for `contents` and `metadata`

Using pysolr 3.10.0 with Solr 9.8.0, I'm getting empty values for the values  `'contents'` and `'metadata'`.  This is because Solr returns values for `'file'` and `'file_metadata'` instead of the aforementioned keys.

```
with open(file_path, 'rb') as temp_file:
            response = solr.extract(file_obj = temp_file,extractOnly=True)
```