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;