SpringBoot 数据存储实战指南

<parent>
    <artifactId>spring-boot-parent</artifactId>
    <groupId>org.springframework.boot</groupId>
    <version>2.1.4.RELEASE</version>
</parent>
```js
```
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

spring.data.elasticsearch.cluster-name=my-cluster
spring.data.elasticsearch.cluster-nodes=192.168.1.202:9300

@Document(indexName = "my_index", type = "my_type")
public class MyDocument {
    @Id
    private String id;
    private String name;
    private String description;
    // 省略构造函数、getter和setter
}

public interface MyDocumentRepository 
extends ElasticsearchRepository<MyDocument, String> {
}

@Service
public class MyDocumentService {
    @Autowired
    private MyDocumentRepository repository;
    public MyDocument save(MyDocument document) {
        return repository.save(document);
    }
    public Iterable<MyDocument> findAll() {
        Iterable<MyDocument> all = repository.findAll();
        return all;
    }
    public MyDocument findById(String id) {
        return repository.findById(id).orElse(null);
    }
    public void deleteById(String id) {
        repository.deleteById(id);
    }
}

@RestController
@RequestMapping("/documents")
public class MyDocumentController {
    @Autowired
    private MyDocumentService service;
    @PostMapping
    public MyDocument create(@RequestBody MyDocument document) {
        return service.save(document);
    }
    @GetMapping
    public Iterable<MyDocument> getAll() {
        Iterable<MyDocument> iterable = service.findAll();
        return iterable;
    }
    @GetMapping("/{id}")
    public MyDocument getById(@PathVariable String id) {
        return service.findById(id);
    }
    @DeleteMapping("/{id}")
    public void deleteById(@PathVariable String id) {
        service.deleteById(id);
    }
}