Spring Boot 2.0.0.M2 and Spring Data Elasticsearch configuration

Question

I'm trying to move my project to Spring Boot 2.0.0.M2.

This is my old Spring Data Elasticsearch configuration:

import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
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.context.annotation.Profile;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;

@Profile("production")
@Configuration
@EnableElasticsearchRepositories(basePackages = "com.example.domain.repository.elasticsearch")
public class ElasticsearchConfig {

    @Value("${elasticsearch.host}")
    private String host;

    @Value("${elasticsearch.port}")
    private int port;

    @Bean
    public Client client() throws Exception {
        return TransportClient.builder().build().addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), port));
    }

    @Bean
    public ElasticsearchOperations elasticsearchTemplate() throws Exception {
        return new ElasticsearchTemplate(client());
    }

}

Right now I faced a following issue:

1. The method builder() is undefined for the type TransportClient
2. InetSocketTransportAddress cannot be resolved to a type

On the Maven classpath I have Spring Data Elasticsearch 3.0.0.M4:

How to properly configure current version of Spring Data Elasticsearch ?

UPDATED

For my tests I use Embedded Elasticsearch with a following application.properties:

#Elasticsearch
spring.data.elasticsearch.properties.http.enabled=true
spring.data.elasticsearch.properties.http.port=9250
spring.data.elasticsearch.properties.path.home=target/test-elasticsearch-db
spring.data.elasticsearch.properties.transport.tcp.connect_timeout=60s

This is my ES test config:

@Profile("test")
@Configuration
@EnableElasticsearchRepositories(basePackages = "com.example.domain.repository.elasticsearch")
public class ElasticsearchTestConfig {
}

Right now the test fails with a following error:

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'elasticsearchTemplate' defined in class path resource [org/springframework/boot/autoconfigure/data/elasticsearch/ElasticsearchDataAutoConfiguration.class]: Unsatisfied dependency expressed through method 'elasticsearchTemplate' parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.elasticsearch.client.Client' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:726) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:458) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]

and

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.elasticsearch.client.Client' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1478) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1089) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]

What is wrong here and how to fix this ?

Answer 1

Spring Boot 2.0 uses Elasticsearch 5 which includes some breaking API changes. You would be shielded from those changes if you used Spring Boot's auto-configuration rather than trying to write your own.

All that's needed is a value for the spring.data.elasticsearch.cluster-nodes property. With that in place, Spring Boot will auto-configure both a TransportClient and an ElasticsearchTemplate.