SolrNet:SolrConnectionException(400)在尝试添加和提交时出现错误请求

我已经到了SolrNet执行"Add"方法的地步，但当我尝试"Commit"时，我收到错误。以下是我的schema.xml、模型、调用它的代码以及我得到的错误。更奇怪的是，尽管出现了错误，但在我重新启动Tomcat后，该模型会被添加到我的Solr索引中（因此，尽管出现错误，它仍然会添加我的模型，但不会立即添加）：

schema.xml（字段和字段类型）:

<!-- Fields -->   
<field name="part_numbers" type="my_string_exact" indexed="true" stored="true" multiValued="true" />
<field name="page_url" type="my_string_exact" indexed="true" stored="true" />
<field name="product_name" type="my_string" indexed="true" stored="true" />
<!-- FieldTypes -->
<fieldType name="my_string_exact" class="solr.StrField" sortMissingLast="true" omitNorms="true"/>
<fieldType name="my_string" class="solr.TextField" sortMissingLast="true" omitNorms="true">
  <analyzer type="index">
    <tokenizer class="solr.KeywordTokenizerFactory" />
    <filter class="solr.LowerCaseFilterFactory" />
  </analyzer>
  <analyzer type="query">
    <tokenizer class="solr.KeywordTokenizerFactory" />
    <filter class="solr.LowerCaseFilterFactory" />
  </analyzer>
</fieldType>
<fieldType name="my_int" class="solr.IntField" omitNorms="true" />

型号（Product.cs）*注意-PageId使用Solr默认的"id"，这是一个字符串，唯一且必需：

public class Product
{
    [SolrUniqueKey("id")]
    public string PageId { get; set; }
    [SolrField("part_numbers")]
    public ICollection<string> PartNumbers { get; set; }
    [SolrField("page_url")]
    public string PageUrl { get; set; }
    [SolrField("product_name")]
    public string Name { get; set; }
}

代码初始化，调用Add and Commit*注意-这是一个单元测试，所以init只调用一次：

Startup.Init<Product>("http://localhost:8080/solr");
Product testProd = new Product() { 
            EPiPageId = "44", 
            Name = "TestProd3", 
            PageUrl = "/TestProd3", 
            PartNumbers = new List<string>() { "000022222", "000000333333" } 
        };
var solr = ServiceLocator.Current.GetInstance<ISolrOperations<Product>>();
solr.Add(testProd);
solr.Commit(); // Bad Request Error occurs here.

错误消息：

SolrNet.Exceptions.SolrConnectionException was unhandled by user code
  HResult=-2146232832
  Message=The remote server returned an error: (400) Bad Request.
  Source=SolrNet
  StackTrace:
       at SolrNet.Impl.SolrConnection.Post(String relativeUrl, String s) in c:'prg'SolrNet'svn'SolrNet'Impl'SolrConnection.cs:line 104
       at SolrNet.Commands.CommitCommand.Execute(ISolrConnection connection) in c:'prg'SolrNet'svn'SolrNet'Commands'CommitCommand.cs:line 71
       at SolrNet.Impl.SolrBasicServer`1.Send(ISolrCommand cmd) in c:'prg'SolrNet'svn'SolrNet'Impl'SolrBasicServer.cs:line 87
       at SolrNet.Impl.SolrBasicServer`1.SendAndParseHeader(ISolrCommand cmd) in c:'prg'SolrNet'svn'SolrNet'Impl'SolrBasicServer.cs:line 91
       at SolrNet.Impl.SolrBasicServer`1.Commit(CommitOptions options) in c:'prg'SolrNet'svn'SolrNet'Impl'SolrBasicServer.cs:line 54
       at SolrNet.Impl.SolrServer`1.Commit() in c:'prg'SolrNet'svn'SolrNet'Impl'SolrServer.cs:line  24
  InnerException: System.Net.WebException
       HResult=-2146233079
       Message=The remote server returned an error: (400) Bad Request.
       Source=System
       StackTrace:
            at System.Net.HttpWebRequest.GetResponse()
            at HttpWebAdapters.Adapters.HttpWebRequestAdapter.GetResponse() in c:'prg'SolrNet'svn'HttpWebAdapters'Impl'HttpWebRequestAdapter.cs:line 36
            at SolrNet.Impl.SolrConnection.GetResponse(IHttpWebRequest request) in c:'prg'SolrNet'svn'SolrNet'Impl'SolrConnection.cs:line 160
            at SolrNet.Impl.SolrConnection.Post(String relativeUrl, String s) in c:'prg'SolrNet'svn'SolrNet'Impl'SolrConnection.cs:line 101
       InnerException: 

EDIT感谢Paige的回答：问题是"waitFlush"错误，这是旧版本SolrNet的错误。我使用的SolrNet版本来自VS NuGet，为0.3.1（我认为这是他们最新的稳定版本）。他们的谷歌代码网站没有他们的最新版本，但有构建服务器（这里：http://teamcity.codebetter.com/project.html?projectId=project36&"artifacts"下的guest=1）确实有最新的修复程序。为我解决了问题。