如何使用SearchResponse中的elasticSearch java api访问聚合结果？

Question

有没有办法使用java API检索搜索响应中的聚合桶？

{
  "took" : 185,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 200,
    "max_score" : 1.0,
    "hits" : [...]
  },
  "aggregations" : {
    "agg1" : {
      "buckets" : [...]
    },
    "agg2" : {
      "buckets" : [...]
    }
  }
}

目前,有可能获得聚合但我无法弄清楚如何获得桶.

当前1.0版本的ElasticSearch(v1.0.0.Beta2)仍然是测试版,也许这个功能仍然需要添加,但也没有找到关于这一点的信息.

Answer 1

查看Github上的ES源代码,我在他们的测试中看到以下内容:

SearchResponse response = client().prepareSearch("idx").setTypes("type")
                .setQuery(matchAllQuery())
                .addAggregation(terms("keys").field("key").size(3).order(Terms.Order.count(false)))
                .execute().actionGet();

Terms  terms = response.getAggregations().get("keys");
Collection<Terms.Bucket> buckets = terms.getBuckets();
assertThat(buckets.size(), equalTo(3));

Answer 2

如果有人想知道访问实际文档,那么代码可能有所帮助.

Terms  terms = response.getAggregations().get("agg1");
Collection<Terms.Bucket> buckets = terms.getBuckets();
for (Bucket bucket : buckets) {
    System.out.println(bucket.getKeyAsText() +" ("+bucket.getDocCount()+")");
}