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.