// for all non-deleted docs in the index); normally
// you'd use a "normal" query:
FacetsCollector.search(searcher, new MatchAllDocsQuery(), 10, fc);
// Retrieve results
Facets facets = new TaxonomyFacetSumValueSource(taxoReader, config, fc, expr.getValueSource(bindings));
FacetResult result = facets.getTopChildren(10, "A");
indexReader.close();
taxoReader.close();
return result;