Unsuccessful low level call on POST--基础连接已经关闭: 服务器关闭了本应保持活动状态的连接

debugInformation": "Unsuccessful low level call on POST: /****/****/_search\r\n# Audit trail of this API call:\r\n - [1] BadResponse: Node: http://****************************/ Took: 00:00:00.0009786\r\n# OriginalException: System.Net.WebException: 基础连接已经关闭: 服务器关闭了本应保持活动状态的连接。\r\n 在 System.Net.HttpWebRequest.GetResponse()\r\n 在 Elasticsearch.Net.HttpConnection.Request[TReturn](RequestData requestData)\r\n# Request:\r\n<Request stream not captured or already read to completion by serializer. Set DisableDirectStreaming() on ConnectionSettings to force it to be set on the response.>\r\n# Response:\r\n<Response stream not captured or already read to completion by serializer. Set DisableDirectStreaming() on ConnectionSettings to force it to be set on the response.>\r\n"