golang 批量插入elasticsearch

package main

import (
   "context"
   "fmt"
   "github.com/olivere/elastic/v7"
   uuid "github.com/satori/go.uuid"
   "log"
   "strconv"
   "time"
)

const mapping = `
{
"settings":{
      "number_of_shards":5,
      "number_of_replicas":2
   },
 "mappings": {
   "properties": {
      "actionName": {
         "type": "keyword"
      },
      "bucketID": {
         "type": "keyword"
      },
      "clientIP": {
         "type": "keyword"
      },
      "contentLength": {
         "type": "long"
      },
      "injectTime": {
         "type": "long"
      },
      "method": {
         "type": "keyword"
      },
      "nodeID": {
         "type": "keyword"
      },
      "objectHash": {
         "type": "keyword"
      },
      "objectKey": {
         "type": "text"
      },
      "objectName": {
         "type": "text"
      },
      "objectPaths": {
         "type": "text"
      },
      "objectUUID": {
         "type": "keyword"
      },
      "objectVer