java - 访问elasticsearch中最大聚合的结果

Question

我正在 elasticsearch 中的数字字段上进行最大聚合，如下所示:

SearchResponse sr = client
                .prepareSearch("test")
                .setTypes("test")
                .setQuery(QueryBuilders.matchAllQuery())
                .addAggregation(
                        AggregationBuilders.max("id").field(
                                "id")).execute().actionGet();

如何访问 java 返回的 max.value？我只能看到一个用于术语聚合的示例。请在这件事上给予我帮助。谢谢。

Answer 1

尝试以下代码，

import org.elasticsearch.search.aggregations.metrics.max.Max;
import org.elasticsearch.search.aggregations.Aggregation;

//process ES Response, it will iterate only once though
// sr = searchResponse
for (Aggregation maxAggs : sr.getAggregations()) {
              Max max = (Max) maxAggs;
              double maxValue = max.getValue();
              System.out.println("maxValue => " + maxValue);
}