springboot中如何集成elasticsearch

1，引入依赖

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
		</dependency>

2，编写实体映射类

@Data
@Document(indexName = "index", createIndex = true)
public class Index {
	@Id
    private String id;

    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
	private String content;
}

3，编写访问接口（如果需要自动创建索引，该接口必须写，否则项目启动时不会自动检测并创建索引）

@Repository
public interface IndexRepository extends ElasticsearchRepository<Index, String> {
	Page<Index> findByContent(String content, Pageable page);
}

4，测试，用了template，和repository两种方式测试

@SpringBootTest
public class EsTest {
	@Autowired
	ElasticsearchRestTemplate esTemplate;
	@Autowired
	IndexRepository indexRepository;
	
	@BeforeEach
	public void init() {
		System.out.println("init");
		indexRepository.deleteAll();
		indexRepository.saveAll(ListUtil.of(
		new Index("1","美国留给伊拉克的是个烂摊子吗"),
		new Index("2","公安部：各地校车将享最高路权"),
		new Index("3","中韩渔警冲突调查：韩警平均每天扣1艘中国渔船"),
		new Index("4","中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首"),
		new Index("5","中国天眼向全球正式开放下月世界大赛将比拼FAST脉冲星搜索")
		));
	}
	
	@Test
	void testRepositoryQuery() {
		Page<Index> pageList = indexRepository.findByContent("中国", PageRequest.of(0, 10));
		pageList.getContent().forEach(e -> {
			System.out.println("repositoryQuery => "+e);
		});
	}
	
	@Test
	void testTemplateQuery() {
		BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery()
				.must(QueryBuilders.simpleQueryStringQuery("中国").field("content"));
		NativeSearchQuery query = new NativeSearchQueryBuilder()
				.withQuery(queryBuilder)
				.withPageable(PageRequest.of(0, 10))
				.build();
		SearchHits<Index> search = esTemplate.search(query, Index.class);
		if(search.hasSearchHits()) {
			search.getSearchHits().forEach(e -> {
				System.out.println("templateQuery => "+e.getContent());
			});
		}
	}
}

init data
templateQuery => Index(id=3, content=中韩渔警冲突调查：韩警平均每天扣1艘中国渔船)
templateQuery => Index(id=4, content=中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首)
templateQuery => Index(id=5, content=中国天眼向全球正式开放下月世界大赛将比拼FAST脉冲星搜索)
init data
repositoryQuery => Index(id=3, content=中韩渔警冲突调查：韩警平均每天扣1艘中国渔船)
repositoryQuery => Index(id=4, content=中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首)
repositoryQuery => Index(id=5, content=中国天眼向全球正式开放下月世界大赛将比拼FAST脉冲星搜索)

5，可启动一个定时任务，定时ping，防止Connection time out

    @Scheduled(fixedRate = 15000)
	public void ping() {
		esTemplate.execute(client -> client.ping(RequestOptions.DEFAULT));
	}

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