Elastic: Sharing a client

elastic-issue-107.go

package main

import (
	"log"
	"sync"

	elastic "gopkg.in/olivere/elastic.v2"
)

var (
	clientInit sync.Once
	client     *elastic.Client
)

func Client() *elastic.Client {
	clientInit.Do(func() {
		c, err := elastic.NewClient()
		if err != nil {
			panic(err)
		}
		client = c
	})
	return client
}

func main() {
	exists, err := Client().IndexExists("name").Do()
	if err != nil {
		log.Fatal(err)
	}
	if !exists {
		log.Print("index does not exist")
	} else {
		log.Print("index already exists")
	}
}