Spring起動Springデータエラスティックサーチの例

この記事では、「Springブート+ Springデータ+ Elasticsearchの例の作成方法」について説明します。
この記事で使用されているツール:
-
春のブート1.5.1.RELEASE
-
スプリングブートスターターデータエラスティックサーチ1.5.1.RELEASE
-
Spring Data Elasticsearch 2.10.RELEASE
-
弾性検索2.4.4
-
Maven
-
Java 8
1.プロジェクトの構成
標準のMavenプロジェクト構造。

プロジェクトの依存関係
Spring Data ElasticSearchアプリケーションのために `spring-boot-startter-data-elasticsearch`を宣言します。
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>springboot-springdata-elasticsearch-example</artifactId>
<packaging>jar</packaging>
<url>/</url>
<version>1.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Runtime, for Embedded Elasticsearch,
comment this if connect to external elastic search server-->
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<!-- Package as an executable jar/war -->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
プロジェクトの依存関係を確認する:
ターミナル
$ mvn dependency:tree[INFO]Scanning for projects...[INFO][INFO]------------------------------------------------------------------------[INFO]Building springboot-springdata-elasticsearch-example 1.0[INFO]------------------------------------------------------------------------[INFO][INFO]--- maven-dependency-plugin:2.10:tree (default-cli) @ springboot-springdata-elasticsearch-example ---[INFO]org.springframework.boot:springboot-springdata-elasticsearch-example:jar:1.0[INFO]+- org.springframework.boot:spring-boot-starter-data-elasticsearch:jar:1.5.1.RELEASE:compile[INFO]| +- org.springframework.boot:spring-boot-starter:jar:1.5.1.RELEASE:compile[INFO]| | +- org.springframework.boot:spring-boot:jar:1.5.1.RELEASE:compile[INFO]| | +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.1.RELEASE:compile[INFO]| | +- org.springframework.boot:spring-boot-starter-logging:jar:1.5.1.RELEASE:compile[INFO]| | | +- ch.qos.logback:logback-classic:jar:1.1.9:compile[INFO]| | | | \- ch.qos.logback:logback-core:jar:1.1.9:compile[INFO]| | | +- org.slf4j:jul-to-slf4j:jar:1.7.22:compile[INFO]| | | \- org.slf4j:log4j-over-slf4j:jar:1.7.22:compile[INFO]| | \- org.yaml:snakeyaml:jar:1.17:compile[INFO]| \- org.springframework.data:spring-data-elasticsearch:jar:2.1.0.RELEASE:compile[INFO]| +- org.springframework:spring-context:jar:4.3.6.RELEASE:compile[INFO]| | +- org.springframework:spring-aop:jar:4.3.6.RELEASE:compile[INFO]| | +- org.springframework:spring-beans:jar:4.3.6.RELEASE:compile[INFO]| | \- org.springframework:spring-expression:jar:4.3.6.RELEASE:compile[INFO]| +- org.springframework:spring-tx:jar:4.3.6.RELEASE:compile[INFO]| +- org.springframework.data:spring-data-commons:jar:1.13.0.RELEASE:compile[INFO]| +- commons-lang:commons-lang:jar:2.6:compile[INFO]| +- joda-time:joda-time:jar:2.9.7:compile[INFO]| +- org.elasticsearch:elasticsearch:jar:2.4.4:compile[INFO]| | +- org.apache.lucene:lucene-core:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-backward-codecs:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-analyzers-common:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-queries:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-memory:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-highlighter:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-queryparser:jar:5.5.2:compile[INFO]| | | \- org.apache.lucene:lucene-sandbox:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-suggest:jar:5.5.2:compile[INFO]| | | \- org.apache.lucene:lucene-misc:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-join:jar:5.5.2:compile[INFO]| | | \- org.apache.lucene:lucene-grouping:jar:5.5.2:compile[INFO]| | +- org.apache.lucene:lucene-spatial:jar:5.5.2:compile[INFO]| | | +- org.apache.lucene:lucene-spatial3d:jar:5.5.2:compile[INFO]| | | \- com.spatial4j:spatial4j:jar:0.5:compile[INFO]| | +- com.google.guava:guava:jar:18.0:compile[INFO]| | +- org.elasticsearch:securesm:jar:1.0:compile[INFO]| | +- com.carrotsearch:hppc:jar:0.7.1:compile[INFO]| | +- com.fasterxml.jackson.dataformat:jackson-dataformat-smile:jar:2.8.6:compile[INFO]| | +- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:jar:2.8.6:compile[INFO]| | +- com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:jar:2.8.6:compile[INFO]| | +- io.netty:netty:jar:3.10.6.Final:compile[INFO]| | +- com.ning:compress-lzf:jar:1.0.2:compile[INFO]| | +- com.tdunning:t-digest:jar:3.0:compile[INFO]| | +- org.hdrhistogram:HdrHistogram:jar:2.1.6:compile[INFO]| | +- commons-cli:commons-cli:jar:1.3.1:compile[INFO]| | \- com.twitter:jsr166e:jar:1.1.0:compile[INFO]| +- com.fasterxml.jackson.core:jackson-core:jar:2.8.6:compile[INFO]| +- com.fasterxml.jackson.core:jackson-databind:jar:2.8.6:compile[INFO]| | \- com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile[INFO]| +- org.slf4j:slf4j-api:jar:1.7.22:compile[INFO]| \- org.slf4j:jcl-over-slf4j:jar:1.7.22:compile[INFO]+- org.springframework.boot:spring-boot-starter-test:jar:1.5.1.RELEASE:test[INFO]| +- org.springframework.boot:spring-boot-test:jar:1.5.1.RELEASE:test[INFO]| +- org.springframework.boot:spring-boot-test-autoconfigure:jar:1.5.1.RELEASE:test[INFO]| +- com.jayway.jsonpath:json-path:jar:2.2.0:test[INFO]| | \- net.minidev:json-smart:jar:2.2.1:test[INFO]| | \- net.minidev:accessors-smart:jar:1.1:test[INFO]| | \- org.ow2.asm:asm:jar:5.0.3:test[INFO]| +- junit:junit:jar:4.12:test[INFO]| +- org.assertj:assertj-core:jar:2.6.0:test[INFO]| +- org.mockito:mockito-core:jar:1.10.19:test[INFO]| | \- org.objenesis:objenesis:jar:2.1:test[INFO]| +- org.hamcrest:hamcrest-core:jar:1.3:test[INFO]| +- org.hamcrest:hamcrest-library:jar:1.3:test[INFO]| +- org.skyscreamer:jsonassert:jar:1.4.0:test[INFO]| | \- com.vaadin.external.google:android-json:jar:0.0.20131108.vaadin1:test[INFO]| +- org.springframework:spring-core:jar:4.3.6.RELEASE:compile[INFO]| \- org.springframework:spring-test:jar:4.3.6.RELEASE:test[INFO]\- net.java.dev.jna:jna:jar:4.2.2:runtime[INFO]------------------------------------------------------------------------[INFO]BUILD SUCCESS[INFO]------------------------------------------------------------------------[INFO]Total time: 1.867 s[INFO]Finished at: 2017-03-14T19:55:41+08:00[INFO]Final Memory: 27M/437M[INFO]------------------------------------------------------------------------
3. Spring Data ElasticSearchアプリケーション
Spring Boot Spring Data Elasticsearchの例を開始しましょう。
3.1。プロジェクトのためのモデルを開発する
Book.java
package com.techfou.book.model;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
@Document(indexName = "techfou", type = "books")
public class Book {
@Id
private String id;
private String title;
private String author;
private String releaseDate;
public Book() {
}
public Book(String id, String title, String author, String releaseDate) {
this.id = id;
this.title = title;
this.author = author;
this.releaseDate = releaseDate;
}
//getters and setters
@Override
public String toString() {
return "Book{" +
"id='" + id + '\'' +
", title='" + title + '\'' +
", author='" + author + '\'' +
", releaseDate='" + releaseDate + '\'' +
'}';
}
}
3.2。プロジェクトのためのElasticsearchリポジトリを開発する
BookRepository.java
package com.mkyong.book.repository;
import com.mkyong.book.model.Book;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import java.util.List;
public interface BookRepository extends ElasticsearchRepository<Book, String> {
Page<Book> findByAuthor(String author, Pageable pageable);
List<Book> findByTitle(String title);
}
3.3。プロジェクトのサービスコンポーネントを開発する
BookService.java
package com.mkyong.book.service;
import com.mkyong.book.model.Book;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import java.util.List;
public interface BookService {
Book save(Book book);
void delete(Book book);
Book findOne(String id);
Iterable<Book> findAll();
Page<Book> findByAuthor(String author, PageRequest pageRequest);
List<Book> findByTitle(String title);
}
BookServiceImpl.java
package com.mkyong.book.service;
import com.mkyong.book.model.Book;
import com.mkyong.book.repository.BookRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class BookServiceImpl implements BookService {
private BookRepository bookRepository;
@Autowired
public void setBookRepository(BookRepository bookRepository) {
this.bookRepository = bookRepository;
}
public Book save(Book book) {
return bookRepository.save(book);
}
public void delete(Book book) {
bookRepository.delete(book);
}
public Book findOne(String id) {
return bookRepository.findOne(id);
}
public Iterable<Book> findAll() {
return bookRepository.findAll();
}
public Page<Book> findByAuthor(String author, PageRequest pageRequest) {
return bookRepository.findByAuthor(author, pageRequest);
}
public List<Book> findByTitle(String title) {
return bookRepository.findByTitle(title);
}
}
3.4。 Elasticsearchプロパティを持つ `application.properties`を開発してください。
application.properties
elasticsearch.clustername = mkyong-cluster elasticsearch.host = localhost elasticsearch.port = 9300 # # Home directory of the embedded Elasticsearch instance. Default to the # current working directory. # #spring.data.elasticsearch.properties.path.home=target/elastic-embedded #spring.data.elasticsearch.properties.transport.tcp.connect__timeout=60s
3.5。 Springブート構成を開発する。 `TransportClient`を介してElasticsearchクラスタに接続する
MkyongElasticsearchConfiguration.java
package com.mkyong;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;
import java.net.InetAddress;
@Configuration
@EnableElasticsearchRepositories(basePackages = "com.mkyong.book.repository")
public class EsConfig {
@Value("${elasticsearch.host}")
private String EsHost;
@Value("${elasticsearch.port}")
private int EsPort;
@Value("${elasticsearch.clustername}")
private String EsClusterName;
@Bean
public Client client() throws Exception {
Settings esSettings = Settings.settingsBuilder()
.put("cluster.name", EsClusterName)
.build();
//https://www.elastic.co/guide/en/elasticsearch/guide/current/__transport__client__versus__node__client.html
return TransportClient.builder()
.settings(esSettings)
.build()
.addTransportAddress(
new InetSocketTransportAddress(InetAddress.getByName(EsHost), EsPort));
}
@Bean
public ElasticsearchOperations elasticsearchTemplate() throws Exception {
return new ElasticsearchTemplate(client());
}
//Embedded Elasticsearch Server
/** @Bean
public ElasticsearchOperations elasticsearchTemplate() {
return new ElasticsearchTemplate(nodeBuilder().local(true).node().client());
}** /
}
4.テストアプリケーションの開発
私たちのコードをユニットテストするための1つのテストアプリケーションを開発しましょう。
BookServiceTest.java
package com.mkyong;
import com.mkyong.book.model.Book;
import com.mkyong.book.service.BookService;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.** ;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)
public class BookServiceTest {
@Autowired
private BookService bookService;
@Autowired
private ElasticsearchTemplate esTemplate;
@Before
public void before() {
esTemplate.deleteIndex(Book.class);
esTemplate.createIndex(Book.class);
esTemplate.putMapping(Book.class);
esTemplate.refresh(Book.class);
}
@Test
public void testSave() {
Book book = new Book("1001", "Elasticsearch Basics", "Rambabu Posa", "23-FEB-2017");
Book testBook = bookService.save(book);
assertNotNull(testBook.getId());
assertEquals(testBook.getTitle(), book.getTitle());
assertEquals(testBook.getAuthor(), book.getAuthor());
assertEquals(testBook.getReleaseDate(), book.getReleaseDate());
}
@Test
public void testFindOne() {
Book book = new Book("1001", "Elasticsearch Basics", "Rambabu Posa", "23-FEB-2017");
bookService.save(book);
Book testBook = bookService.findOne(book.getId());
assertNotNull(testBook.getId());
assertEquals(testBook.getTitle(), book.getTitle());
assertEquals(testBook.getAuthor(), book.getAuthor());
assertEquals(testBook.getReleaseDate(), book.getReleaseDate());
}
@Test
public void testFindByTitle() {
Book book = new Book("1001", "Elasticsearch Basics", "Rambabu Posa", "23-FEB-2017");
bookService.save(book);
List<Book> byTitle = bookService.findByTitle(book.getTitle());
assertThat(byTitle.size(), is(1));
}
@Test
public void testFindByAuthor() {
List<Book> bookList = new ArrayList<>();
bookList.add(new Book("1001", "Elasticsearch Basics", "Rambabu Posa", "23-FEB-2017"));
bookList.add(new Book("1002", "Apache Lucene Basics", "Rambabu Posa", "13-MAR-2017"));
bookList.add(new Book("1003", "Apache Solr Basics", "Rambabu Posa", "21-MAR-2017"));
bookList.add(new Book("1007", "Spring Data + ElasticSearch", "Rambabu Posa", "01-APR-2017"));
bookList.add(new Book("1008", "Spring Boot + MongoDB", "Mkyong", "25-FEB-2017"));
for (Book book : bookList) {
bookService.save(book);
}
Page<Book> byAuthor = bookService.findByAuthor("Rambabu Posa", new PageRequest(0, 10));
assertThat(byAuthor.getTotalElements(), is(4L));
Page<Book> byAuthor2 = bookService.findByAuthor("Mkyong", new PageRequest(0, 10));
assertThat(byAuthor2.getTotalElements(), is(1L));
}
@Test
public void testDelete() {
Book book = new Book("1001", "Elasticsearch Basics", "Rambabu Posa", "23-FEB-2017");
bookService.save(book);
bookService.delete(book);
Book testBook = bookService.findOne(book.getId());
assertNull(testBook);
}
}
5. Springブートアプリケーションを実行する
5.1このデモを実行するには、この手順に従ってください
-
前提条件1:
Javaをインストールし、JAVA__HOMEおよびPATH変数を設定します。 -
前提条件2:
Mavenをインストールします。 -
前提条件3:
インストール
エラスティックサーチ
2.4.0
+
ELASTICSEARCH__HOME = C:\ elasticsearch-2.4.0と仮定しましょう。
前提条件-4:** ElasticSearch Cluster +の設定
$ \ {ELASTICSEARCH__HOME} \ config \ elasticsearch.ymlを開き、
次の設定
+
$ \ {ELASTICSEARCH__HOME} \ config \ elasticsearch.yml
+
cluster.name:mkyong-cluster
-
前提条件5:
エラスティックサーチインスタンスを開始する
5.2 Spring Boot Applicationを実行すると、3つのブックオブジェクトがElastic Serverに挿入されます。
Application.java
package com.mkyong;
import com.mkyong.book.model.Book;
import com.mkyong.book.service.BookService;
import org.elasticsearch.client.Client;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import java.util.Map;
@SpringBootApplication
public class Application implements CommandLineRunner {
@Autowired
private ElasticsearchOperations es;
@Autowired
private BookService bookService;
public static void main(String args[]) {
SpringApplication.run(Application.class, args);
}
@Override
public void run(String... args) throws Exception {
printElasticSearchInfo();
bookService.save(new Book("1001", "Elasticsearch Basics", "Rambabu Posa", "23-FEB-2017"));
bookService.save(new Book("1002", "Apache Lucene Basics", "Rambabu Posa", "13-MAR-2017"));
bookService.save(new Book("1003", "Apache Solr Basics", "Rambabu Posa", "21-MAR-2017"));
//fuzzey search
Page<Book> books = bookService.findByAuthor("Rambabu", new PageRequest(0, 10));
//List<Book> books = bookService.findByTitle("Elasticsearch Basics");
books.forEach(x -> System.out.println(x));
}
//useful for debug, print elastic search details
private void printElasticSearchInfo() {
System.out.println("--ElasticSearch--");
Client client = es.getClient();
Map<String, String> asMap = client.settings().getAsMap();
asMap.forEach((k, v) -> {
System.out.println(k + " = " + v);
});
System.out.println("--ElasticSearch--");
}
}
出力
. ________ __ ____ __ __
/\\/______'__ ____ __ __(__)__ ____ ____ __ \ \ \ \
( ( )\______ | '__ | '__| | '__ \/__` | \ \ \ \
\\/ ______)| |__)| | | | | || (__| | ) ) ) )
' |________| .____|__| |__|__| |__\____, |//// =========|__|==============|______/=/__/__/__/ :: Spring Boot :: (v1.5.1.RELEASE)
//...
--ElasticSearch--
client.type = transport
cluster.name = mkyong-cluster
名前=バアル
network.server = false
node.client = true
transport.ping__schedule = 5s
- エラスティックサーチ -
Book {id = '1001'、タイトル= 'Elasticsearch Basics'、作者= 'Rambabu Posa'、releaseDate = '23 -FEB-2017 '}
Book {id = '1002'、title = 'Apache Lucene Basics'、作者= 'Rambabu Posa'、releaseDate = '13 -MAR-2017 '}
Book {id = '1003'、title = 'Apache Solr Basics'、作者= 'Rambabu Posa'、releaseDate = '21 -MAR-2017 '}//...
アプリケーションを実行すると、データは$ \ {ELASTICSEARCH__HOME} \ data \ mkyong-clusterに保存されます。
5.3 Mavenパッケージを実行して実行します。
ターミナル
$ mvn package $ java -jar target/springboot-springdata-elasticsearch-example-1.0.jar
5.4 `cURL`ツールでテストします。
ターミナル
C:\curl-7.53.1\bin>curl "http://localhost:9200/mkyong/books/__search?pretty=true"
{
"took" : 3,
"timed__out" : false,
"__shards" : {
"total" : 5,
"successful" : 5,
"failed" : 0
},
"hits" : {
"total" : 3,
"max__score" : 1.0,
"hits" :[{
"__index" : "mkyong",
"__type" : "books",
"__id" : "1001",
"__score" : 1.0,
"__source" : {
"id" : "1001",
"title" : "Elasticsearch Basics",
"author" : "Rambabu Posa",
"releaseDate" : "23-FEB-2017"
}
}, {
"__index" : "mkyong",
"__type" : "books",
"__id" : "1002",
"__score" : 1.0,
"__source" : {
"id" : "1002",
"title" : "Apache Lucene Basics",
"author" : "Rambabu Posa",
"releaseDate" : "13-MAR-2017"
}
}, {
"__index" : "mkyong",
"__type" : "books",
"__id" : "1003",
"__score" : 1.0,
"__source" : {
"id" : "1003",
"title" : "Apache Solr Basics",
"author" : "Rambabu Posa",
"releaseDate" : "21-MAR-2017"
}
}] }
}
ターミナル
C:\curl-7.53.1\bin>curl "http://localhost:9200/mkyong/books/__search?q=__id:1003&pretty=true"
{
"took" : 3,
"timed__out" : false,
"__shards" : {
"total" : 5,
"successful" : 5,
"failed" : 0
},
"hits" : {
"total" : 1,
"max__score" : 1.0,
"hits" :[{
"__index" : "mkyong",
"__type" : "books",
"__id" : "1003",
"__score" : 1.0,
"__source" : {
"id" : "1003",
"title" : "Apache Solr Basics",
"author" : "Rambabu Posa",
"releaseDate" : "21-MAR-2017"
}
}] }
}
ソースコードをダウンロードする
ダウンロード:
springboot-elasticsearch-example.zip
(10 KB)
参考文献
リポジトリ]。
http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-nosql.html#boot-features-connecting-to-elasticsearch-spring-data
[Connecting
Springデータを使用した弾性検索]。
https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples/spring-boot-sample-data-elasticsearch
[Spring
公式の例 – 春のブート+春のデータ+ ElasticSearch]。
http://geekabyte.blogspot.my/2015/08/embedding-elasticsearch-in-spring.html
[Embedding
SpringアプリケーションでのElasticSearch]。
https://github.com/spring-projects/spring-data-elasticsearch/wiki/Spring-Data-Elasticsearch—Spring-Boot—version-matrix
[Spring
Data Elasticsearch Springブートバージョンマトリックス]。
https://www.elastic.co/guide/en/elasticsearch/guide/current/
transport
client
versus
node__client.html[Transport
クライアントとノードクライアント]。リンク://elasticsearch/elasticsearch-hello-world-example/[Elasticsearch
こんにちは世界の例]