英文:
Getting only aggregations results in elasticsearch
问题
我正在进行类似这样的聚合操作：
{"size": 0,"aggs": {"my_aggs": {"terms": {"field": "my_field"}}}}
我想要获得仅聚合结果。因此，当我像下面这样设置 size=0 时，会出现错误 - 后来了解到这是我想要的结果数量（聚合结果）。那么，我如何做才能仅获得聚合结果（而不获取命中的文档结果）呢？
AbstractAggregationBuilder aggregationBuilder = AggregationBuilders.terms("my_aggs").field("my_field").size(0) // 如何为我的目的设置 size？.order(BucketOrder.key(true));
此外，如果我获得数千个聚合结果，这个查询会将它们全部返回吗？还是只会应用默认的大小 10？如果不是，我如何知道应该设置聚合结果的 size。 <br><br><br>
编辑 我是这样添加我的聚合的：
SearchQuery searchQuery = new NativeSearchQueryBuilder().withIndices(indexName).withTypes(typeName).withQuery(boolQueryBuilder).addAggregation(aggregationBuilder).build();
请提供帮助。
英文:
I am doing aggregation like this:
{"size":0,"aggs":{"my_aggs":{"terms":{"field":"my_field"}}}}
I want to get only the aggregation result. So when I set size=0 like below, it gives error-later learned this is for how many results I want(aggregations). So, how can I achieve this to get only the aggregation results(no hits result docs)
AbstractAggregationBuilder aggregationBuilder = AggregationBuilders.terms("my_aggs").field("my_field").size(0) //how to set size for my purpose?.order(BucketOrder.key(true));
Moreover, If I get thousands of aggregation results, does this query return all of them? or apply to its default 10 size? If not, how do know how many should I set size of aggregation result.<br><br><br>
Edit I am adding my aggregation like this:
SearchQuery searchQuery = new NativeSearchQueryBuilder().withIndices(indexName).withTypes(typeName).withQuery(boolQueryBuilder).addAggregation(aggregationBuilder).build();
Please help.
答案1
得分: 2
你需要在 SearchRequest 实例上进行操作，而不是在聚合级别进行操作：
AbstractAggregationBuilder aggregationBuilder = AggregationBuilders.terms("my_aggs").field("my_field").order(BucketOrder.key(true));SearchQuery searchQuery = new NativeSearchQueryBuilder().withIndices(indexName).withTypes(typeName).withQuery(boolQueryBuilder).withPageable(new PageRequest(0, 1)) // <--- 在此添加.addAggregation(aggregationBuilder).build();
据我所知，Spring Data ES 不允许您创建一个大小为 0 的 PageRequest（这就是我选择 1 的原因）。如果这是个问题，这个回答 展示了如何覆盖这个行为。
默认情况下，您的聚合将返回 10 个桶，但如果需要的话，您可以将大小增加到 10000。
英文:
You do that on the SearchRequest instance not at the aggregation level:
AbstractAggregationBuilder aggregationBuilder = AggregationBuilders.terms("my_aggs").field("my_field").order(BucketOrder.key(true));SearchQuery searchQuery = new NativeSearchQueryBuilder().withIndices(indexName).withTypes(typeName).withQuery(boolQueryBuilder).withPageable(new PageRequest(0, 1)) <--- add this.addAggregation(aggregationBuilder).build();
As far as I know, Spring Data ES doesn't allow you to create a PageRequest with size 0 (hence why I picked 1). If that's a problem, this answer shows you how to override that behavior.
By default, your aggregation will return 10 buckets, but you can increase the size up to 10000, if needed.
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