## Package org.apache.lucene.facet.search.aggregator

Aggregating Facets during Faceted Search

See:
Description

Interface Summary
Aggregator: An Aggregator is the analogue of Lucene's Collector (see `Collector`), for processing the categories belonging to a certain document.

Class Summary
ComplementCountingAggregator: A `CountingAggregator` used during complement counting.
CountingAggregator: A CountingAggregator updates a counter array with the size of the whole taxonomy, counting the number of times each category appears in the given set of documents.
ScoringAggregator: An `Aggregator` which updates the weight of a category according to the scores of the documents it was found in.

## Package org.apache.lucene.facet.search.aggregator Description

# Aggregating Facets during Faceted Search

A facets aggregator is the parallel of Lucene's Collector. While Collector collected matching documents, an aggregator aggregates facets of a matching document.