title: The client is unable to verify that the server is Elasticsearch due to an unsuccessful product check call
body: <p>I Use ElasticSearch 8.1.2
  and Nest 17.7.1</p>
  <pre class="lang-cs prettyprint-override"><code>var settings = new ConnectionSettings(new Uri(&quot;http://localhost:9200/&quot;))
              .CertificateFingerprint(&quot;A5:8B:07:2D:A9:E8:53:CE:GB:C0:15:CE:6E:DF:9C:65:89:A3:AC:D2:94:2C:46:BD:85:23:20:6B:F2:69:B3:88&quot;)
              .BasicAuthentication(&quot;elastic&quot;, &quot;-L-uXRg5=iOXGFgebP68&quot;)                  
              .DeadTimeout(TimeSpan.FromSeconds(300))
              .DefaultIndex(&quot;people&quot;);
  var client = new ElasticClient(settings);
  var person = new Person
  {
      Id = 1,
      FirstName = &quot;Martijn&quot;,
      LastName = &quot;Laarman&quot;
  };
  var asyncIndexResponse = await client.IndexDocumentAsync(person);
  return Task.CompletedTask;
  </code></pre>
  <p>But I have Error
  <a href="https://i.stack.imgur.com/MUXGO.png" rel="nofollow noreferrer">enter image description here</a></p>
  <p>error message:
  Message = &quot;The client is unable to verify that the server is Elasticsearch due to an unsuccessful product check call. Some functionality may not be compatible if the server is running an unsupported product. Call: Status code unknown from: GET /&quot;</p>