https://github.com/helloworldtang/spring-data-elasticsearch

1、None of the configured nodes are available 或者

　　org.elasticsearch.transport.RemoteTransportException: Failed to deserialize exception response from stream

　原因：spring data elasticSearch 的版本与Spring boot、Elasticsearch版本不匹配。

　解决：

　　　　这是版本之间的对应关系。Spring boot 1.3.5默认的elasticsearch版本是1.5.2，此时启动1.7.2版本以下的Elasticsearch客户端连接正常。

　　注：注意java的es默认连接端口是9300，9200是http端口，这两个在使用中应注意区分。

2、Caused by: java.lang.IllegalArgumentException: @ConditionalOnMissingBean annotations must specify at least one bean (type, name or annotation)

　　原因：spring boot是1.3.x版本，而es采用了2.x版本。在es的2.x版本去除了一些类，而这些类在spring boot的1.3.x版本中仍然被使用，导致此错误。

　　解决：依照问题1中的版本对应关系，启动特定版本的es即可。

We often use Elasticsearch to improve performance in our application, especially searching and caching, to make our application scale and adapt in real-time.

Elasticsearch is a flexible and powerful open source, distributed, real-time search and analytics engine. In this article, I would like to introduce how to use Elasticsearch in java applications: by using Spring Boot data Elasticsearch. Spring Boot now easy and powerful, and we can build fast Java and web applications with a simple configuration.

By following the steps below, you can start writing your first application.

Source code: https://github.com/herotl2005/spring-data-elasticsearch-sample

Requirement enviroment

1. Install Elasticsearch

2. Install Gradle

3. IDE Eclipse or Intellij  IDEA

Step by Step Coding

1. Gradle build 

dependencies {testCompile group: ‘junit‘, name: ‘junit‘, version: ‘4.11‘compile ‘org.springframework.boot:spring-boot-starter-data-elasticsearch:1.2.0.RELEASE‘compile ‘org.springframework.data:spring-data-cassandra:1.1.1.RELEASE‘compile ‘org.springframework:spring-test:4.1.2.RELEASE‘compile ‘org.springframework.boot:spring-boot-starter-logging:1.2.0.RELEASE‘compile ‘org.springframework.boot:spring-boot-starter-web:1.2.0.RELEASE‘compile ‘org.springframework.boot:spring-boot-starter-actuator:1.2.0.RELEASE‘}

2. Elasticsearch configuration

@Configuration@PropertySource(value = "http://www.mamicode.com/classpath:elasticsearch.properties")@EnableElasticsearchRepositories(basePackages = "co.paan.repository")public class ElasticsearchConfiguration {    @Resourceprivate Environment environment;@Beanpublic Client client() {        TransportClient client = new TransportClient();TransportAddress address = new InetSocketTransportAddress(environment.getProperty("elasticsearch.host"), Integer.parseInt(environment.getProperty("elasticsearch.port")));client.addTransportAddress(address);        return client;}    @Beanpublic ElasticsearchOperations elasticsearchTemplate() {        return new ElasticsearchTemplate(client());     }}

You put elasticsearch host and post in your application properties file.

elasticsearch.host = localhost # if you use you local elasticsearch hostelasticsearch.port = 9300

3. Data mapping object: 

In this application, we have 2 entities data object mapping: Post and Tag

@Document(indexName = "post", type = "post", shards = 1, replicas = 0)public class Post {@Idprivate String id;    private String title;// @Field(type= FieldType.Nested)private List<Tag> tags;    public String getId() {        return id;}    public void setId(String id) {        this.id = id;}    public String getTitle() {        return title;}    public void setTitle(String title) {        this.title = title;}    public List<Tag> getTags() {        return tags;}    public void setTags(List<Tag> tags) {        this.tags = tags;}}

public class Tag { private String id;    private String name;    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;  }}

4. Repository: we extends from ElasticsearchRepository

public interface PostRepository extends ElasticsearchRepository<Post, String>{    Page<Post> findByTagsName(String name, Pageable pageable);}

5. Data access service

public interface PostService {    Post save(Post post);    Post findOne(String id);    Iterable<Post> findAll();    Page<Post> findByTagsName(String tagName, PageRequest pageRequest);}

@Servicepublic class PostServiceImpl implements PostService{    @Autowiredprivate PostRepository postRepository;@Overridepublic Post save(Post post) {        postRepository.save(post);                      return post;       }    @Overridepublic Post findOne(String id) {        return postRepository.findOne(id);   }    @Overridepublic Iterable<Post> findAll() {        return postRepository.findAll();   }    @Overridepublic Page<Post> findByTagsName(String tagName, PageRequest pageRequest) {        return postRepository.findByTagsName(tagName, pageRequest);   }}

6. Testing and the result

@Testpublic void testFindByTagsName() throws Exception {Tag tag = new Tag();tag.setId("1");tag.setName("tech");Tag tag2 = new Tag();tag2.setId("2");tag2.setName("elasticsearch");Post post = new Post();post.setId("1");post.setTitle("Bigining with spring boot application and elasticsearch");post.setTags(Arrays.asList(tag, tag2));postService.save(post);Post post2 = new Post();post2.setId("1");post2.setTitle("Bigining with spring boot application");post2.setTags(Arrays.asList(tag));postService.save(post);Page<Post> posts  = postService.findByTagsName("tech", new PageRequest(0,10));Page<Post> posts2  = postService.findByTagsName("tech", new PageRequest(0,10));Page<Post> posts3  = postService.findByTagsName("maz", new PageRequest(0,10));assertThat(posts.getTotalElements(), is(1L));assertThat(posts2.getTotalElements(), is(1L));assertThat(posts3.getTotalElements(), is(0L));}

7. You can find detail project at github: https://github.com/herotl2005/spring-data-elasticsearch-sample

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