lucene-java-3.4.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/package.html

   1 <html>
   2   <head>
   3     <title>Aggregating Facets during Faceted Search</title>
   4   </head>
   5   <body>
   6     <h1>Aggregating Facets during Faceted Search</h1>
   7
   8     A facets aggregator is the parallel of Lucene's Collector.
   9     While Collector collected matching documents,
  10     an aggregator aggregates facets of a matching document.
  11   </body>
  12 </html>