如何从Elasticsearch 6.4.3回滚到5.6.12？

Question

我为版本5.6.12的群集拍摄了快照，已升级到6.4.3，但现在想移回5.6.12 ... 是否可以通过还原此快照来回滚？

我尝试在Kibana中运行以下命令：

POST /_snapshot/my_backup/snapshot_07-11-2018/_restore
{
  "include_global_state": true
}

但是我收到以下错误，不知道这意味着什么吗？

{
  "error": {
    "root_cause": [
      {
        "type": "invalid_index_name_exception",
        "reason": "Invalid index name [.triggered_watches], already exists as alias",
        "index_uuid": "_na_",
        "index": ".triggered_watches"
      }
    ],
    "type": "invalid_index_name_exception",
    "reason": "Invalid index name [.triggered_watches], already exists as alias",
    "index_uuid": "_na_",
    "index": ".triggered_watches"
  },
  "status": 400
}