golang 操作es批量刪除 NewDeleteByQueryService

var Client *elastic.Client
var host = "http://XXX.XX.XX.XXX:9200"

type ES struct {
	Index string
	Type  string
}

// 初始化
func init() {
	errorLog := log.New(os.Stdout, "APP", log.LstdFlags)
	var err error
	Client, err = elastic.NewClient(elastic.SetErrorLog(errorLog), elastic.SetURL(host))
	if err != nil {
		log.Fatalf("請檢查是否連接vpn"+"\n", err)
	}
	info, code, err := Client.Ping(host).Do(context.Background())
	if err != nil {
		panic(err)
	}
	log.Printf("Elasticsearch returned with code %d and version %s\n", code, info.Version.Number)
	esVersion, err := Client.ElasticsearchVersion(host)
	if err != nil {
		panic(err)
	}
	log.Printf("Elasticsearch version %s\n", esVersion)
}


func delData() {
	es := tool.ES{
		Index: "XXXX.XX.XX",
		Type:  "XXXXXXXXX",
	}

	var delQuery elastic.Query
	delQuery = elastic.NewMatchPhraseQuery("tradeDate", "2019-06-05")

	res, err := elastic.NewDeleteByQueryService(Client).
		Index(es.Index).
		Type(es.Type).
		Query(delQuery).
		Do(context.Background())

	if err != nil {
		println(err.Error())
		return
	}

	fmt.Printf(string(res.Total))
}