Examples of org.apache.lucene.facet.DrillDownQuery

org.apache.lucene.facet.DrillDownQuery
A {@link Query} for drill-down over facet categories. Youshould call {@link #add(String,String)} for every group of categories youwant to drill-down over.
NOTE: if you choose to create your own {@link Query} by calling{@link #term}, it is recommended to wrap it with {@link ConstantScoreQuery}and set the {@link ConstantScoreQuery#setBoost(float) boost} to {@code 0.0f}, so that it does not affect the scores of the documents. @lucene.experimental

        FacetsCollector fc = new FacetsCollector();
        searcher.search(new MatchAllDocsQuery(), fc);
        Facets facets = new FastTaxonomyFacetCounts(taxoReader, config, fc);
        assertEquals(1, facets.getSpecificValue("A", Integer.toString(id, 16)).intValue());
        
        DrillDownQuery drillDown = new DrillDownQuery(config);
        drillDown.add("A", Integer.toString(id, 16));
        TopDocs docs = searcher.search(drillDown, 10);
        assertEquals(1, docs.totalHits);
      }
      return null;
    }

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