Elasticsearch实现复合查询高亮结果功能

public TransportClient esClient() throws UnknownHostException{
    Settings settings = Settings.builder()
        .put("cluster.name", "my-application") //节点的名字
        .put("client.transport.sniff", true)
        .build();
    
    InetSocketTransportAddress iAddress = new InetSocketTransportAddress( //连接es的ip地址和端口号
        InetAddress.getByName("127.0.0.1"),9300
        );
    
    //根据先前的配置生成client,后面的操作基本都是基于这个
    TransportClient client = new PreBuiltTransportClient(settings)
        .addTransportAddress(iAddress);
    return client;
  }

 TransportClient esClient = esClient();  //获取先前生成的client
    BoolQueryBuilder boolQuery = QueryBuilders.boolQuery(); //生成复合查询构造器
    
    boolQuery.mustNot(
        QueryBuilders.matchQuery("",) //字段必须不包含啥 
        );
    
    boolQuery.should(
        QueryBuilders.matchQuery(, )  //字段可以包含啥,相当于或者
        );

    boolQuery.must(
        QueryBuilders.matchQuery(,) //字段必须包含啥
        );

//配置标题高亮显示
    HighlightBuilder highlightBuilder = new HighlightBuilder(); //生成高亮查询器
    highlightBuilder.field(title);   //高亮查询字段
    highlightBuilder.field(content);  //高亮查询字段
    highlightBuilder.requireFieldMatch(false);   //如果要多个字段高亮,这项要为false
    highlightBuilder.preTags("<span style=\"color:red\">");  //高亮设置
    highlightBuilder.postTags("</span>");
    //下面这两项,如果你要高亮如文字内容等有很多字的字段,必须配置,不然会导致高亮不全,文章内容缺失等
    highlightBuilder.fragmentSize(800000); //最大高亮分片数
    highlightBuilder.numOfFragments(0); //从第一个分片获取高亮片段

// 根据字段进行排序,这里我根据时间进行倒排
FieldSortBuilder timeSort = SortBuilders.fieldSort("time").order(SortOrder.DESC); 
     
    //查询请求生成
    SearchRequestBuilder requestBuilder = esClient.prepareSearch(indexname)//索引名字
            .setTypes(indextype)   //索引类型
            .setQuery(boolQuery)   //配置查询条件
            .addSort(new ScoreSortBuilder())  //根据查询相关度进行排序
            .addSort(timeSort)         //再根据时间进行排序
            .setTrackScores(true)       //避免分页之后相关性乱了
            .highlighter(highlightBuilder)   //配置高亮
            .setFrom(from)         //设置分页
            .setSize();

 //获取查询结果
    SearchResponse searchResponse = requestBuilder.get();
    List<Map<String, Object>> course = new ArrayList<>(); 
    if(searchResponse.status() != RestStatus.OK){
      return course;
    }
    for(SearchHit hit:searchResponse.getHits()){
      //获取高亮字段
      Map<String, HighlightField> highlightFields = hit.getHighlightFields();
      HighlightField titleField = highlightFields.get("");
      HighlightField contentField = highlightFields.get("");
      Map<String, Object> source = hit.getSource();
      //千万记得要记得判断是不是为空,不然你匹配的第一个结果没有高亮内容,那么就会报空指针异常,这个错误一开始真的搞了很久
      if(titleField!=null){
        Text[] fragments = titleField.fragments(); 
        String name = "";
        for (Text text : fragments) {
        name+=text;
        }
        source.put("", name);  //高亮字段替换掉原本的内容
        }
      course.add(source);
    }
    esClient.close();   //用完记得关闭
    return course;