Parallel.ForEach并行下载文件时遇ThreadAbortException（超时超5分钟）的最佳解决方法问询

我现在在做一个.NET 4.8的应用，用Parallel.ForEach循环并行从Web API下载多个文件，但最近碰到个棘手的问题：时不时会抛出ThreadAbortException，错误提示是「The Maximum Wait/Sleep/Join time has been exceeded (00:05:00)」。我找了半天，都没找到怎么延长Parallel.ForEach里线程的最大等待超时时间。

下面是出问题的示例代码：

// create the httpclient
using (HttpClient httpClient = new HttpClient())
{
    // now try to get documents in a parallel threaded task.
    Parallel.ForEach(documentIds,
        new ParallelOptions { MaxDegreeOfParallelism =
            Convert.ToInt32(Math.Ceiling((Environment.ProcessorCount * 0.50) * 2.0))},
        (documentId) =>
        {
            try
            {
                // post the data to the service
                using (HttpResponseMessage response =
                    httpClient.PostAsync(serviceURL, new StringContent(
                        requestBody.ToString())).GetAwaiter().GetResult())
                {
                    // show error if service failed
                    if (response.IsSuccessStatusCode == false)
                    {
                        throw new Exception("Error getting content. " +
                            response?.ReasonPhrase);
                    }
                    // get back content
                    using (Stream responseStream = response.Content.ReadAsStreamAsync()
                        .GetAwaiter().GetResult())
                    {
                        // write the file to the FileSystem
                    }
                }
            }
            catch (Exception ex)
            {
                // eat the error
                // NOTE: This does catch the ThreadAbortException but it breaks out
                // of the Parallel.ForEach BUT I want it to continue with other documents
            }
        });
}

更新1：临时解决但不符合最佳实践 #

我后来勉强让程序跑起来了，但这个方案明显有问题——根源在HttpClient上。如果我把HttpClient的创建移到Parallel.ForEach循环内部，每次迭代都新建一个实例，确实能捕获ThreadAbortException而且不会中断整个循环。但微软的最佳实践明确说了不能频繁创建多个HttpClient，不然会导致大量套接字在被回收前一直处于打开状态，时间长了肯定出问题。

现在我想找个既符合最佳实践，又能解决超时中断问题的办法。

备注：内容来源于stack exchange，提问作者goroth