solr api add_engine报错

我运行了官方的例子，solr默认engine的名字为collection1，我想在solr中添加一个collection，我找到了solr_tools 中的add_engine方法，add_engine("localhost", "collection2", 8900)调用后报了如下错误，不知道如何解决
```bash
*****[Request Error]: Solr instance is not running in SolrCloud mode.
```

Start with the solr_tools add_engine method and the official example referenced in the report. Check how the Solr instance is configured and whether its mode matches the method's requirement; done means adding collection2 no longer produces the SolrCloud mode error.

Written by the indexing model from the issue text.