java - 如何从 Avg Aggregation Builder elasticsearch 获取特定键的平均值

Question

我正在尝试使用特殊键从 Elastic search 获取结果 示例:

average salary, by city, gender

所以我检查 metrics_aggregations

我能够

AvgAggregationBuilder totalDuration = AggregationBuilders.avg("salaryAvg").field("salary");

它确实返回了最高级别 - 没有特定字段的平均工资

所以我尝试使用subAggregation

AvgAggregationBuilder totalDuration =     AggregationBuilders
            .avg("salaryAvg").field("salary")
            .subAggregation(AggregationBuilders.terms("city").field("gender"));

但我遇到了以下错误

Server Error. 21525\nElasticsearchStatusException[Elasticsearch exception [type=aggregation_initialization_exception, reason=Aggregator [salaryAvg] of type [avg] cannot accept sub-aggregations]]\n\tat org.elasticsearch.rest.BytesRestResponse.errorFromXConten

如何使用 Elasticsearch 查询它 我想要的是与 SQL 非常相似的东西 - group by

我的弹性响应数据的每一行看起来都是这样的:

widgetResponse.getHits().getHits()[0].getSourceAsMap().get("attributes")


{HashMap$Node@53898} "city" -> "new York"
{HashMap$Node@53899} "pageId" -> "123"
{HashMap$Node@53900} "salary" -> "45765"
{HashMap$Node@53900} "gender" -> "female"
{HashMap$Node@53901} "userId" -> "324"
{HashMap$Node@53902} "accountId" -> "456"


widgetResponse.getHits().getHits()[1].getSourceAsMap().get("attributes")


{HashMap$Node@53898} "city" -> "new Jersy"
{HashMap$Node@53899} "pageId" -> "123"
{HashMap$Node@53899} "salary" -> "77777"
{HashMap$Node@53900} "gender" -> "female"
{HashMap$Node@53901} "userId" -> "334"
{HashMap$Node@53902} "accountId" -> "999"

如何使用 Elastic search JAVA API 支持它？

我也尝试过

运行它:

        AvgAggregationBuilder totalDuration0 = AggregationBuilders.avg(TOTAL_DURATION_AVG).field(TOTAL_DURATION);
    TermsAggregationBuilder totalDuration = AggregationBuilders.terms(TOTAL_DURATION_AVG)
            .field(ATTRIBUTES_WIDGET_ID).subAggregation(totalDuration0);

我收到了这个回复

似乎有不同的平均值和行数 对于此列表中的每一行 但我不知道哪个“键”指向 看起来像一个字节数组

但它与我的实际 key 不匹配 [key] 似乎也以不同的平均值重复 那么我在这里缺少什么。 ？

Answer 1

我能够通过单个字段获得平均值，但不能获得多个字段

    final AvgAggregationBuilder totalDuration = AggregationBuilders.avg(avgSalary).field(SALARY_AVG);
    final TermsAggregationBuilder totalDurationByWidgetId = AggregationBuilders.terms(SALARY_AVG)
            .field(GENDER).subAggregation(avgSalary);