<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
    </parent>

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

@Slf4j
@Service
public class PostServiceImpl extends ServiceImpl<PostMapper, PostEntity>
        implements IPostService {

    @Autowired
    private ElasticSearchPostMapper elasticSearchPostMapper;

    @Autowired
    private ElasticsearchRestTemplate elasticsearchTemplate;
 
 	@Override
    public List<PostIndex> searchInES(PostDto dto) {

        //根据一个值查询多个字段  并高亮显示  这里的查询是取并集，即多个字段只需要有一个字段满足即可
        //需要查询的字段
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery()
//                .should(QueryBuilders.matchQuery("content", dto.getContent()))
                .should(QueryBuilders.matchQuery("content", dto.getContent()));
        //构建高亮查询
        NativeSearchQuery searchQuery = new NativeSearchQueryBuilder()
                .withQuery(boolQueryBuilder)
                .withHighlightFields(
                        new HighlightBuilder.Field("content"))
                .withHighlightBuilder(new HighlightBuilder().preTags("<span style='color:red'>").postTags("</span>"))
                .build();
        //查询
        SearchHits<PostIndex> search = elasticsearchTemplate.search(searchQuery, PostIndex.class);

        List<SearchHit<PostIndex>> searchHits = search.getSearchHits();
        //设置一个最后需要返回的实体类集合
        List<PostIndex> list = new ArrayList<>();
        //遍历返回的内容进行处理
        for (SearchHit<PostIndex> searchHit : searchHits) {
            //高亮的内容
            Map<String, List<String>> highlightFields = searchHit.getHighlightFields();
            //将高亮的内容填充到content中
            searchHit.getContent().setContent(highlightFields.get("content") == null ? searchHit.getContent().getContent() : highlightFields.get("content").get(0));
//            searchHit.getContent().setInfo(highlightFields.get("info") == null ? searchHit.getContent().getInfo() : highlightFields.get("info").get(0));
            //放到实体类中
            list.add(searchHit.getContent());
        }

        return list;
    }
}