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mapping.go
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mapping.go
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// 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 creates an index with a mapping with different data types.
//
// Example
//
//
// mapping -url=http://127.0.0.1:9200 -index=twitter -type=tweet
//
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"log"
"time"
"github.com/olivere/elastic"
)
const (
mapping = `
{
"settings":{
"number_of_shards":1,
"number_of_replicas":0
},
"mappings":{
"_doc":{
"properties":{
"user":{
"type":"keyword"
},
"message":{
"type":"text"
},
"retweets":{
"type":"integer"
},
"created":{
"type":"date"
},
"attributes":{
"type":"object"
}
}
}
}
}
`
)
// Tweet is just an example document.
type Tweet struct {
User string `json:"user"`
Message string `json:"message"`
Retweets int `json:"retweets"`
Created time.Time `json:"created"`
Attrs map[string]interface{} `json:"attributes,omitempty"`
}
func main() {
var (
url = flag.String("url", "http://localhost:9200", "Elasticsearch URL")
sniff = flag.Bool("sniff", true, "Enable or disable sniffing")
index = flag.String("index", "", "Index name")
)
flag.Parse()
log.SetFlags(0)
if *url == "" {
*url = "http://127.0.0.1:9200"
}
if *index == "" {
log.Fatal("please specify an index name -index")
}
// Create an Elasticsearch client
client, err := elastic.NewClient(elastic.SetURL(*url), elastic.SetSniff(*sniff))
if err != nil {
log.Fatal(err)
}
_ = client
// Check if index already exists. We'll drop it then.
// Next, we create a fresh index/mapping.
ctx := context.Background()
exists, err := client.IndexExists(*index).Do(ctx)
if err != nil {
log.Fatal(err)
}
if exists {
_, err := client.DeleteIndex(*index).Do(ctx)
if err != nil {
log.Fatal(err)
}
}
_, err = client.CreateIndex(*index).Body(mapping).Do(ctx)
if err != nil {
log.Fatal(err)
}
// Add a tweet
{
tweet := Tweet{
User: "olivere",
Message: "Welcome to Go and Elasticsearch.",
Retweets: 0,
Created: time.Now(),
Attrs: map[string]interface{}{
"views": 17,
"vip": true,
},
}
_, err := client.Index().
Index(*index).
Type("_doc").
Id("1").
BodyJson(&tweet).
Refresh("true").
Do(context.TODO())
if err != nil {
log.Fatal(err)
}
}
// Read the tweet
{
doc, err := client.Get().
Index(*index).
Type("_doc").
Id("1").
Do(context.TODO())
if err != nil {
log.Fatal(err)
}
var tweet Tweet
if err = json.Unmarshal(*doc.Source, &tweet); err != nil {
log.Fatal(err)
}
fmt.Printf("%s at %s: %s (%d retweets)\n",
tweet.User,
tweet.Created,
tweet.Message,
tweet.Retweets,
)
fmt.Printf(" %v\n", tweet.Attrs)
}
}