java - 从 ElasticSearch 7.3 中获取字段。用 Springboot java 编写文档

Question

我正在使用以下 java 代码查询 elasticsearch 7.3 并获取 1 个文档。我已将其设置为只有 1 个得分最高的文档。它工作正常，并完美地返回了我的文档。

  @Autowired
    RestHighLevelClient client;

    @RequestMapping(value = "/search", method = RequestMethod.GET)
    public @ResponseBody
    String getItem(@RequestParam("string") String string) throws IOException {


        QueryBuilder matchQueryBuilder = QueryBuilders.simpleQueryStringQuery(string);
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(matchQueryBuilder);
        sourceBuilder.from(0);
        sourceBuilder.size(1);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        SearchRequest searchRequest = new SearchRequest("nutrients");
        searchRequest.source(sourceBuilder);

        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        return searchResponse.toString();
    }

响应如下，我想使用 java 代码访问值Calories , Fat , Protein , Carbohydrate并忽略 other 的值Nutrient。我需要 4 个变量中的值，就像String caloriesVar=153 kcal其他 3 个变量一样。

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