下面是注册GCS存储库的Python代码：

import requests
from grabconfig import grabconfig

(HOSTS, ign) = grabconfig()

reqHeaders = {'content-type' : 'application/json'}

for h in HOSTS:
    url = f'http://{h}:9200'

    r = requests.put(f'{url}/_snapshot/prod_backup2',
                              '''{ \"type\" : \"gcs\" }, { \"settings\" :  { \"client\" : \"secondary\", \"bucket\" : \"prod_backup2\" },
                                       { \"compress\" : \"true\" }}''',
                              headers=reqHeaders)
    print(r)
    print(r.json())
    r2 = requests.get(f'{url}/_cat/snapshots')
    print(r2)
    print(r2.json())

我使用的配置文件是prod.py文件：

HOSTS = ['10.x.x.x']

BACKUP_REPO = ['prod_backup2']

但当我运行代码时，总是会出现以下错误：

<Response [500]>
{'error': {'root_cause': [{'type': 'repository_exception', 'reason': '[prod_backup2] repository type [gcs] does not exist'}], 'type': 'repository_exception', 'reason': '[prod_backup2] repository type [gcs] does not exist'}, 'status': 500}