es分页from+size,scroll,search_after

es分页用from+size的方式超过1万条就查不出数据了。

查询大于1万的数据这里使用scroll和go-elasiticsearch简单写一个demo

package main

import (
	"bytes"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/elastic/go-elasticsearch/v8"
	"github.com/tidwall/gjson"
)

var c *elasticsearch.Client
var once sync.Once

func main() {
	log.SetFlags(0) //这里设置的0即取消log格式化输出，输出的内容和使用fmt包下的println()格式一样

	var (
		batchNum int
		scrollID string
	)

	es := setElastic([]string{"http://ip:9200"})

	// Index 100 documents into the "test-scroll" index
	//测试写入100个document
	log.Println("Indexing the documents...")
	for i := 1; i <= 100; i++ {
		res, err := es.Index(
			"test-scroll",
			strings.NewReader(`{"title" : "test"}`),
			es.Index.WithDocumentID(strconv.Itoa(i)),
		)
		if err != nil || re