Golang elastic.NewClient函数代码示例

func ExampleClient_NewClient_cluster() {
	// Obtain a client for an Elasticsearch cluster of two nodes,
	// running on 10.0.1.1 and 10.0.1.2.
	client, err := elastic.NewClient(elastic.SetURL("http://10.0.1.1:9200", "http://10.0.1.2:9200"))
	if err != nil {
		// Handle error
		panic(err)
	}
	_ = client
}

// InitClient sets up the elastic client. If the client has already been
// initalized it is a noop
func (e LogstashElasticHosts) InitClient() error {
	if lsClient == nil {
		var err error
		lsClient, err = elastic.NewClient(elastic.SetURL(e...), elastic.SetMaxRetries(10))
		if err != nil {
			return err
		}
	}
	return nil
}

func ExampleGetTemplateService() {
	client, err := elastic.NewClient()
	if err != nil {
		panic(err)
	}

	// Get template stored under "my-search-template"
	resp, err := client.GetTemplate().Id("my-search-template").Do()
	if err != nil {
		panic(err)
	}
	fmt.Printf("search template is: %q\n", resp.Template)
}

func ExampleClusterStateService() {
	client, err := elastic.NewClient()
	if err != nil {
		panic(err)
	}

	// Get cluster state
	res, err := client.ClusterState().Metric("version").Do()
	if err != nil {
		panic(err)
	}
	fmt.Printf("Cluster %q has version %d", res.ClusterName, res.Version)
}

func ExampleClient_NewClient_default() {
	// Obtain a client to the Elasticsearch instance on http://localhost:9200.
	client, err := elastic.NewClient()
	if err != nil {
		// Handle error
		fmt.Printf("connection failed: %v\n", err)
	} else {
		fmt.Println("connected")
	}
	_ = client
	// Output:
	// connected
}

func ExampleSearchResult() {
	client, err := elastic.NewClient()
	if err != nil {
		panic(err)
	}

	// Do a search
	searchResult, err := client.Search().Index("twitter").Query(elastic.NewMatchAllQuery()).Do()
	if err != nil {
		panic(err)
	}

	// searchResult is of type SearchResult and returns hits, suggestions,
	// and all kinds of other information from Elasticsearch.
	fmt.Printf("Query took %d milliseconds\n", searchResult.TookInMillis)

	// Each is a utility function that iterates over hits in a search result.
	// It makes sure you don't need to check for nil values in the response.
	// However, it ignores errors in serialization. If you want full control
	// over iterating the hits, see below.
	var ttyp Tweet
	for _, item := range searchResult.Each(reflect.TypeOf(ttyp)) {
		t := item.(Tweet)
		fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
	}
	fmt.Printf("Found a total of %d tweets\n", searchResult.TotalHits())

	// Here's how you iterate hits with full control.
	if searchResult.Hits != nil {
		fmt.Printf("Found a total of %d tweets\n", searchResult.Hits.TotalHits)

		// Iterate through results
		for _, hit := range searchResult.Hits.Hits {
			// hit.Index contains the name of the index

			// Deserialize hit.Source into a Tweet (could also be just a map[string]interface{}).
			var t Tweet
			err := json.Unmarshal(*hit.Source, &t)
			if err != nil {
				// Deserialization failed
			}

			// Work with tweet
			fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
		}
	} else {
		// No hits
		fmt.Print("Found no tweets\n")
	}
}

func ExampleSearchService() {
	// Get a client to the local Elasticsearch instance.
	client, err := elastic.NewClient()
	if err != nil {
		// Handle error
		panic(err)
	}

	// Search with a term query
	termQuery := elastic.NewTermQuery("user", "olivere")
	searchResult, err := client.Search().
		Index("twitter").   // search in index "twitter"
		Query(&termQuery).  // specify the query
		Sort("user", true). // sort by "user" field, ascending
		From(0).Size(10).   // take documents 0-9
		Pretty(true).       // pretty print request and response JSON
		Do()                // execute
	if err != nil {
		// Handle error
		panic(err)
	}

	// searchResult is of type SearchResult and returns hits, suggestions,
	// and all kinds of other information from Elasticsearch.
	fmt.Printf("Query took %d milliseconds\n", searchResult.TookInMillis)

	// Number of hits
	if searchResult.Hits != nil {
		fmt.Printf("Found a total of %d tweets\n", searchResult.Hits.TotalHits)

		// Iterate through results
		for _, hit := range searchResult.Hits.Hits {
			// hit.Index contains the name of the index

			// Deserialize hit.Source into a Tweet (could also be just a map[string]interface{}).
			var t Tweet
			err := json.Unmarshal(*hit.Source, &t)
			if err != nil {
				// Deserialization failed
			}

			// Work with tweet
			fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
		}
	} else {
		// No hits
		fmt.Print("Found no tweets\n")
	}
}

func ExampleDeleteTemplateService() {
	client, err := elastic.NewClient()
	if err != nil {
		panic(err)
	}

	// Delete template
	resp, err := client.DeleteTemplate().Id("my-search-template").Do()
	if err != nil {
		panic(err)
	}
	if resp != nil && resp.Found {
		fmt.Println("template deleted")
	}
}

func ExampleClusterHealthService() {
	client, err := elastic.NewClient()
	if err != nil {
		panic(err)
	}

	// Get cluster health
	res, err := client.ClusterHealth().Index("twitter").Do()
	if err != nil {
		panic(err)
	}
	if res == nil {
		panic(err)
	}
	fmt.Printf("Cluster status is %q\n", res.Status)
}

func ExampleClusterHealthService_WaitForGreen() {
	client, err := elastic.NewClient()
	if err != nil {
		panic(err)
	}

	// Wait for status green
	res, err := client.ClusterHealth().WaitForStatus("green").Timeout("15s").Do()
	if err != nil {
		panic(err)
	}
	if res.TimedOut {
		fmt.Printf("time out waiting for cluster status %q\n", "green")
	} else {
		fmt.Printf("cluster status is %q\n", res.Status)
	}
}

func ExampleIndexExistsService() {
	// Get a client to the local Elasticsearch instance.
	client, err := elastic.NewClient()
	if err != nil {
		// Handle error
		panic(err)
	}
	// Use the IndexExists service to check if the index "twitter" exists.
	exists, err := client.IndexExists("twitter").Do()
	if err != nil {
		// Handle error
		panic(err)
	}
	if exists {
		// ...
	}
}

func ExampleDeleteIndexService() {
	// Get a client to the local Elasticsearch instance.
	client, err := elastic.NewClient()
	if err != nil {
		// Handle error
		panic(err)
	}
	// Delete an index.
	deleteIndex, err := client.DeleteIndex("twitter").Do()
	if err != nil {
		// Handle error
		panic(err)
	}
	if !deleteIndex.Acknowledged {
		// Not acknowledged
	}
}

func ExampleAggregations() {
	// Get a client to the local Elasticsearch instance.
	client, err := elastic.NewClient()
	if err != nil {
		// Handle error
		panic(err)
	}

	// Create an aggregation for users and a sub-aggregation for a date histogram of tweets (per year).
	timeline := elastic.NewTermsAggregation().Field("user").Size(10).OrderByCountDesc()
	histogram := elastic.NewDateHistogramAggregation().Field("created").Interval("year")
	timeline = timeline.SubAggregation("history", histogram)

	// Search with a term query
	searchResult, err := client.Search().
		Index("twitter").                  // search in index "twitter"
		Query(elastic.NewMatchAllQuery()). // return all results, but ...
		SearchType("count").               // ... do not return hits, just the count
		Aggregation("timeline", timeline). // add our aggregation to the query
		Pretty(true).                      // pretty print request and response JSON
		Do()                               // execute
	if err != nil {
		// Handle error
		panic(err)
	}

	// Access "timeline" aggregate in search result.
	agg, found := searchResult.Aggregations.Terms("timeline")
	if !found {
		log.Fatalf("we sould have a terms aggregation called %q", "timeline")
	}
	for _, userBucket := range agg.Buckets {
		// Every bucket should have the user field as key.
		user := userBucket.Key

		// The sub-aggregation history should have the number of tweets per year.
		histogram, found := userBucket.DateHistogram("history")
		if found {
			for _, year := range histogram.Buckets {
				fmt.Printf("user %q has %d tweets in %q\n", user, year.DocCount, year.KeyAsString)
			}
		}
	}
}

func ExampleClient_NewClient_manyOptions() {
	// Obtain a client for an Elasticsearch cluster of two nodes,
	// running on 10.0.1.1 and 10.0.1.2. Do not run the sniffer.
	// Set the healthcheck interval to 10s. When requests fail,
	// retry 5 times. Print error messages to os.Stderr and informational
	// messages to os.Stdout.
	client, err := elastic.NewClient(
		elastic.SetURL("http://10.0.1.1:9200", "http://10.0.1.2:9200"),
		elastic.SetSniff(false),
		elastic.SetHealthcheckInterval(10*time.Second),
		elastic.SetMaxRetries(5),
		elastic.SetErrorLog(log.New(os.Stderr, "ELASTIC ", log.LstdFlags)),
		elastic.SetInfoLog(log.New(os.Stdout, "", log.LstdFlags)))
	if err != nil {
		// Handle error
		panic(err)
	}
	_ = client
}

func ExampleWildcardQuery() {
	// Get a client to the local Elasticsearch instance.
	client, err := elastic.NewClient()
	if err != nil {
		// Handle error
		panic(err)
	}

	// Define wildcard query
	q := elastic.NewWildcardQuery("user", "oli*er?").Boost(1.2)
	searchResult, err := client.Search().
		Index("twitter"). // search in index "twitter"
		Query(q).         // use wildcard query defined above
		Do()              // execute
	if err != nil {
		// Handle error
		panic(err)
	}
	_ = searchResult
}