/// <summary>
        /// 创建更新Mapping
        /// </summary>
        /// <param name="index"></param>
        /// <param name="type"></param>
        /// <param name="mapping"></param>
        /// <returns></returns>
        public bool PutMapping(string index, string type, string mapping)
        {
            bool           flag   = false;
            StringResponse resStr = null;

            try
            {
                resStr = client.IndicesPutMapping <StringResponse>(index, type,
                                                                   PostData.String(mapping));
                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 mappings.
        /// </summary>
        /// <param name="type">Type name.</param>
        /// <param name="mapping">Modified mapping.</param>
        /// <returns>Updated mappings.</returns>
        protected FieldDefinitionList UpdateMapping(String type,
                                                    String mapping)
        {
            ElasticsearchResponse <DynamicResponse> response;

            Debug.WriteLine("Update mapping = " + mapping);
            response = _client.IndicesPutMapping <DynamicResponse>(IndexName, type, mapping);
            CheckResponse(response);
            if (response.Body.IsNotNull() && (response.Body.Count > 0))
            {
                return(GetMapping(type));
            }
            else
            {
                return(null);
            }
        }