golang elasticsearch individual insert

package main

import (
    "context"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "log"
    "os"

    "github.com/olivere/elastic"
)

func main() {
    // check if all elasticsearch env vars were exported
    url := os.Getenv("ELASTIC_URL")
    index := os.Getenv("ELASTIC_INDEX")
    _type := os.Getenv("ELASTIC_TYPE")

    if url == "" || index == "" || _type == "" {
        log.Fatal("Please set all elastic search env vars.")
    }

    // Open our jsonFile
    jsonFile, _ := os.Open("states.json")
    defer jsonFile.Close()

    byteValue, _ := ioutil.ReadAll(jsonFile)

    var states States

    json.Unmarshal(byteValue, &states)

    //  get elasticsearch client
    fmt.Println("Get elasticsearch client...")
    client, _ := elastic.NewClient()
    ctx := context.Background()

    fmt.Println("Start insert into elasticsearch...")

    for i := 0; i < len(states.States); i++ {
        _, _ = client.Index().Index(index).Type(_type).Id(states.States[i].State).BodyJson(states.States[i]).Do(ctx)
    }

    fmt.Println("Done...")
}

// State reference of a single state
type State struct {
    State      string `json:"state"`
    Population uint32 `json:"population"`
}

// States list of states
type States struct {
    States []State `json:"states"`
}