elasticsearch 实现搜索关键字的高亮显示（spring-data-elasticsearch）

/**
  *@业务描述： 用于对es搜索结果再加工
  */
public class HighlightResultMapper implements SearchResultMapper {
    @Override
    public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> clazz, Pageable pageable) {
        long totalHits = searchResponse.getHits().getTotalHits();
        List<T> list = new ArrayList<>();
        SearchHits hits = searchResponse.getHits();
        if (hits.getHits().length> 0) {
            for (SearchHit searchHit : hits) {
                Map<String, HighlightField> highlightFields = searchHit.getHighlightFields();
                T item = JSON.parseObject(searchHit.getSourceAsString(), clazz);
                Field[] fields = clazz.getDeclaredFields();
                for (Field field : fields) {
                    field.setAccessible(true);
                    if (highlightFields.containsKey(field.getName())) {
                        try {
                            field.set(item, highlightFields.get(field.getName()).fragments()[0].toString());
                        } catch (IllegalAccessException e) {
                            e.printStackTrace();
                        }
                    }
                }
                list.add(item);
            }
        }
        return new AggregatedPageImpl<>(list, pageable, totalHits);
    }
    @Override
    public <T> T mapSearchHit(SearchHit searchHit, Class<T> aClass) {
        return null;
    }

/**
     * 高亮显示
     * @param keyword
     * @param pageNum
     * @param pageSize
     * @return
     */
    @GetMapping("/getUserList")
    public Page<User> query2( String keyword, Integer pageNum, Integer pageSize) {
        if(pageNum == null || pageNum <= 0){
            pageNum = 1;
        }
        if(pageSize == null || pageSize <= 0){
            pageSize = 5;
        }
        String preTags = "<span style=\"color:#F56C6C\">";
        String postTags = "</span>";
        HighlightBuilder.Field firstName = new HighlightBuilder.Field("firstName").preTags(preTags).postTags(postTags);
        HighlightBuilder.Field lastName = new HighlightBuilder.Field("lastName").preTags(preTags).postTags(postTags);
        HighlightBuilder.Field[] fields =new  HighlightBuilder.Field[2];
        fields[0]= firstName;
        fields[1]= lastName;
        SearchQuery searchQuery = null;
        if (!StringUtils.isEmpty(keyword)) {
            searchQuery = new NativeSearchQueryBuilder()
                    .withPageable(PageRequest.of(pageNum - 1, pageSize))
                    .withQuery(QueryBuilders.multiMatchQuery(keyword, "firstName", "lastName"))
                    .withHighlightFields(fields)
                    .withSort(SortBuilders.fieldSort("age").order(SortOrder.DESC))
                    .build();
        } else {
            searchQuery = new NativeSearchQueryBuilder()
                    .withPageable(PageRequest.of(pageNum - 1, pageSize))
                    .withQuery(QueryBuilders.matchAllQuery())
                    .withSort(SortBuilders.fieldSort("age").order(SortOrder.DESC))
                    .build();
        }
        Page<User> users = estemplate.queryForPage(searchQuery, User.class, new HighlightResultMapper());
        return  users;
    }