unhelpful `AlgoliaUnreachableHostException` error

I have a dictionary with records that I'm trying to use to generate an index. But when trying to do

```python
request_options = {
"autoGenerateObjectIDIfNotExist":True,
}

index.replace_all_objects(records, request_options)
```

I get

```python-traceback
raise AlgoliaUnreachableHostException("Unreachable hosts")
algoliasearch.exceptions.AlgoliaUnreachableHostException: Unreachable hosts
```

But if I try a dummy example where records is `[{"test": "test"}]` things work. It is unclear to me what's happening, because the error message is not helpful.

For the record:
- each record size are <10KB
- the `records` list has only 821 objects.

I've tried adding read and write timeouts but it doesn't seem to help.

```python
request_options = {
"autoGenerateObjectIDIfNotExist":True,
"readTimeout": 300,
"writeTimeout": 300,
}
```

How do I debug the issue?

- Algolia Client Version:
`algoliasearch 3.0.0 pypi_0 pypi`

- Language Version:
Python 3.10.13

issue 中没有指定源文件或测试。首先使用提供的 821 条记录输入重现失败，并跟踪 AlgoliaUnreachableHostException 在何处抛出；将这条路径与正常工作的一条记录示例进行比较。当失败能够揭示有用且可采取行动的原因，而不只是报告无法访问的主机时，即表示完成。

由索引模型根据 Issue 内容生成。