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

 TransportClient esClient = esClient();  //獲取先前生成的client    BoolQueryBuilder boolQuery = QueryBuilders.boolQuery(); //生成復合查詢構造器        boolQuery.mustNot(        QueryBuilders.matchQuery("",) //字段必須不包含啥         );        boolQuery.should(        QueryBuilders.matchQuery(, )  //字段可以包含啥,相當于或者        );    boolQuery.must(        QueryBuilders.matchQuery(,) //字段必須包含啥        );

//配置標題高亮顯示    HighlightBuilder highlightBuilder = new HighlightBuilder(); //生成高亮查詢器    highlightBuilder.field(title);   //高亮查詢字段    highlightBuilder.field(content);  //高亮查詢字段    highlightBuilder.requireFieldMatch(false);   //如果要多個字段高亮,這項要為false    highlightBuilder.preTags("<span style=/"color:red/">");  //高亮設置    highlightBuilder.postTags("</span>");    //下面這兩項,如果你要高亮如文字內容等有很多字的字段,必須配置,不然會導致高亮不全,文章內容缺失等    highlightBuilder.fragmentSize(800000); //最大高亮分片數    highlightBuilder.numOfFragments(0); //從第一個分片獲取高亮片段

// 根據字段進行排序,這里我根據時間進行倒排FieldSortBuilder timeSort = SortBuilders.fieldSort("time").order(SortOrder.DESC);          //查詢請求生成    SearchRequestBuilder requestBuilder = esClient.prepareSearch(indexname)//索引名字            .setTypes(indextype)   //索引類型            .setQuery(boolQuery)   //配置查詢條件            .addSort(new ScoreSortBuilder())  //根據查詢相關度進行排序            .addSort(timeSort)         //再根據時間進行排序            .setTrackScores(true)       //避免分頁之后相關性亂了            .highlighter(highlightBuilder)   //配置高亮            .setFrom(from)         //設置分頁            .setSize();

 //獲取查詢結果    SearchResponse searchResponse = requestBuilder.get();    List<Map<String, Object>> course = new ArrayList<>();     if(searchResponse.status() != RestStatus.OK){      return course;    }    for(SearchHit hit:searchResponse.getHits()){      //獲取高亮字段      Map<String, HighlightField> highlightFields = hit.getHighlightFields();      HighlightField titleField = highlightFields.get("");      HighlightField contentField = highlightFields.get("");      Map<String, Object> source = hit.getSource();      //千萬記得要記得判斷是不是為空,不然你匹配的第一個結果沒有高亮內容,那么就會報空指針異常,這個錯誤一開始真的搞了很久      if(titleField!=null){        Text[] fragments = titleField.fragments();         String name = "";        for (Text text : fragments) {        name+=text;        }        source.put("", name);  //高亮字段替換掉原本的內容        }      course.add(source);    }    esClient.close();   //用完記得關閉    return course;