Retrieve aggregations using Spring Data Elasticsearch Reactive Template

Question

We are using Spring Data Elasticsearch Reactive Template

Query searchQuery = new NativeSearchQueryBuilder()
                .withQuery(queryBuilder)
                .withPageable(PageRequest.of(0, 10))
                .addAggregation(AggregationBuilders.terms("categories").field("category"))
                .build();

reactiveElasticsearchTemplate.search(searchQuery, documentType, IndexCoordinates.of(indexName))

In response we have Flux<SearchHit<T>> but there are no methods to retrieve aggregations.

How to retrieve the aggregations?

Abacus · Accepted Answer · 2020-06-19 12:59:28Z

2

The ReactiveElasticsearchTemplate has aggregate methods.

See the corresponding API interface

There is no combination of the single entities in a flux and the aggregations in the reactive part.

answered Jun 19, 2020 at 12:59

Abacus

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4 Comments

user13674325 Over a year ago

Thank you, I also found this pull request github.com/spring-projects/spring-data-elasticsearch/pull/203

Abacus Over a year ago

This PR is about parsing the aggregation data, but it only considers StringTerms and LongTerms buckets, but aggregations are much more complex. For Spring Data Elasticsearch to support parsing aggregations, we would need to handle far more cases of aggregations. So at the moments we just return the Elasticsearch aggregations.

user13674325 Over a year ago

So, in case we want to return both hits and aggregations, we need to call 2 methods which each will return Flux<T> and than to combine these 2 Flux<T> into 1 Flux<T>, is this correct?

Abacus Over a year ago

search returns Flux<SearchHit<T>> and aggregate returns Flux<Aggregation>. The returned types a different, aggregation objects are no entities

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