如何在sping-data-elasticsearch中使用聚合获取elasticsearch json响应？

Question

我有以下内容：我注意到在运行代码的末尾，如果我打印出aggregations.asMap（）. get（'subject'）；我得到：org.elasticsearch.search.aggregations.bucket.terms.StringTerms@6cff59fa

打印出“聚合”给了我：org.elasticsearch.search.aggregations.InternalAggregations@65cf321d

我真正想要的是整个字符串/json响应，如果您要在elasticsearch上卷曲以获取聚合，通常会返回该响应。如何从聚合查询中获取原始响应？此外，是否有方法迭代并打印出那些“包装”对象中的内容？

https://github.com/spring-projects/spring-data-elasticsearch/blob/ab7e870d5f82f6c0de236048bd7001e8e7d2a680/src/test/java/org/springframework/data/elasticsearch/core/aggregation/ElasticsearchTemplateAggregationTests.java

@Test
public void shouldReturnAggregatedResponseForGivenSearchQuery() {
    // given
    SearchQuery searchQuery = new NativeSearchQueryBuilder()
            .withQuery(matchAllQuery())
            .withSearchType(COUNT)
            .withIndices("articles").withTypes("article")
            .addAggregation(terms("subjects").field("subject"))
            .build();
    // when
    Aggregations aggregations = elasticsearchTemplate.query(searchQuery, new ResultsExtractor<Aggregations>() {
        @Override
        public Aggregations extract(SearchResponse response) {
            return response.getAggregations();
        }
    });
    // then
    System.out.println(aggregations); // gives me some cryptic InternalAggregations object, how do I get to the raw JSON normally returned by elasticsearch?
    System.out.println(aggregations.asMap().get("subjects")); // gives me some StringTerms object I have no idea how to iterate over to get results
}

Answer 1

将EsRequest的大小设置为零

获取Esresponse.to字符串（）

将字符串转换为Json

从Json获取聚合字段。

Answer 2

您无法以这种方式获得原始JSON响应，因为Spring Data Elasticsearch将负责为您解析它，这就是重点。

如果您需要解析这些桶，您可以这样轻松地完成：

...
StringTerms subjects = aggregations.asMap().get("subjects");
for (Terms.Bucket bucket : subjects.getBuckets()) {
    String key = bucket.getKey();
    long docCount = bucket.getDocCount();
    // do something with the key and the doc count
}

如果您真的想看到JSON被返回，您可以做的是使用序列化将解析的Aggregations对象重新写入JSON，但这并没有真正的帮助：

InternalAggregations aggregations = ...;
XContentBuilder jsonBuilder = JsonXContent.contentBuilder();
aggregations.toXContent(jsonBuilder, ToXContent.EMPTY_PARAMS);
String rawJson = jsonBuilder.string();