You can display the most relevant documents per entity, for example, the most recent GPS tracks per flight. To get this data, Elasticsearch first groups your data using a terms aggregation, then accumulates the most relevant documents based on sort order for each entry using a top hits metric aggregation.
Top hits per entity is available for vector layers with Documents source. To enable top hits:
- In Sorting, select the Show documents per entity checkbox.
- Set Entity to the field that identifies entities in your documents. This field will be used in the terms aggregation to group your documents into entity buckets.
Set Documents per entity to configure the maximum number of documents accumulated per entity.
This setting is limited to the
index.max_inner_result_windowindex setting, which defaults to 100.