/// <summary>
        /// 优化写入性能
        /// </summary>
        /// <param name="index"></param>
        /// <param name="refresh"></param>
        /// <param name="replia"></param>
        /// <returns></returns>
        public bool SetIndexRefreshAndReplia(string index, string refresh = "30s", int replia = 1)
        {
            bool           flag   = false;
            StringResponse resStr = null;

            try
            {
                resStr = client.IndicesPutSettings <StringResponse>(index,
                                                                    PostData.String($"{{\"index\" : {{\"number_of_replicas\" : {replia},\"refresh_interval\":\"{refresh}\"}}}}"));
                var resObj = JObject.Parse(resStr.Body);
                if ((bool)resObj["acknowledged"])
                {
                    flag = true;
                }
                else
                {
                    LogUtil.LogInfo(logger, resStr.DebugInformation, nodeId);
                }
            }
            catch (Exception ex)
            {
                if (resStr != null)
                {
                    LogUtil.LogInfo(logger, resStr.DebugInformation, nodeId);
                }
                LogUtil.LogError(logger, ex.ToString(), nodeId);
            }

            return(flag);
        }
        /// <summary>
        /// Update settings.
        /// </summary>
        /// <param name="settings">Modified settings.</param>
        protected void UpdateSettings(String settings)
        {
            ElasticsearchResponse <DynamicResponse> response;

            Debug.WriteLine("Update settings = " + settings);
            response = _client.IndicesPutSettings <DynamicResponse>(IndexName, settings);
            CheckResponse(response);
        }