Connect to ES6

go.mod

module example.com/es6

go 1.13

require (
	github.com/mailru/easyjson v0.7.0 // indirect
	github.com/olivere/elastic v6.2.27+incompatible
	github.com/pkg/errors v0.9.1 // indirect
)

go.sum

github.com/mailru/easyjson v0.7.0 h1:aizVhC/NAAcKWb+5QsU1iNOZb4Yws5UO2I+aIprQITM=
github.com/mailru/easyjson v0.7.0/go.mod h1:KAzv3t3aY1NaHWoQz1+4F1ccyAH66Jk7yos7ldAVICs=
github.com/olivere/elastic v6.2.27+incompatible h1:c57kY8PF/J6Iz2ATxHQkWFNkYyKDlEZr6hl/O5ZFNvQ=
github.com/olivere/elastic v6.2.27+incompatible/go.mod h1:J+q1zQJTgAz9woqsbVRqGeB5G1iqDKVBWLNSYW8yfJ8=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=

main.go

// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.

// Connect simply connects to Elasticsearch.
//
// Example
//
//
//     connect -url=http://127.0.0.1:9200 -sniff=false
//
package main

import (
	"flag"
	"fmt"
	"log"

	"github.com/olivere/elastic"
)

func main() {
	var (
		url   = flag.String("url", "http://localhost:9200", "Elasticsearch URL")
		sniff = flag.Bool("sniff", true, "Enable or disable sniffing")
	)
	flag.Parse()
	log.SetFlags(0)

	if *url == "" {
		*url = "http://127.0.0.1:9200"
	}

	// Create an Elasticsearch client
	client, err := elastic.NewClient(elastic.SetURL(*url), elastic.SetSniff(*sniff))
	if err != nil {
		log.Fatal(err)
	}
	_ = client

	// Just a status message
	fmt.Println("Connection succeeded")
}

shell

$ go mod init example.com/es6
go: creating new go.mod: module example.com/es6
$ go get
$ go build
$ ls -al
total 15648
drwxr-xr-x   6 oliver  staff      192 Feb 12 14:58 ./
drwxr-xr-x  34 oliver  staff     1088 Feb 12 14:56 ../
-rwxr-xr-x   1 oliver  staff  7997628 Feb 12 14:58 es6*
-rw-r--r--   1 oliver  staff      183 Feb 12 14:58 go.mod
-rw-r--r--   1 oliver  staff      531 Feb 12 14:58 go.sum
-rw-r--r--   1 oliver  staff      868 Feb 12 14:57 main.go
$ ./es6 -url=http://127.0.0.1:9200 -sniff=false
Connection succeeded