iamsanjay commented on issue #13191:
URL: https://github.com/apache/lucene/issues/13191#issuecomment-2006026200

   `FloatTaxonomyFacets.getTopChildrenForPath` methods counts the children and 
apply the aggregate function for all the child nodes, only IF the child value 
is greater than 0.
   
https://github.com/apache/lucene/blob/d393b9d03952c69d9641cd4a38bbe83939a25942/lucene/facet/src/java/org/apache/lucene/facet/taxonomy/FloatTaxonomyFacets.java#L217-L227
   
   On the test side, we have method which would prepare the expected result of 
aggregation, however, this time we don't filter child.
   
   
https://github.com/apache/lucene/blob/d393b9d03952c69d9641cd4a38bbe83939a25942/lucene/facet/src/test/org/apache/lucene/facet/taxonomy/TestTaxonomyFacetValueSource.java#L691-L700
   
   Therefore, there is inconsistency between the number of child generated 
actual vs expected. 
   
   Below can be a possible fix at the test level, assuming that the 
functionality of FloatTaxonomyFacets.getTopChildrenForPath behaves as intended.
   
   ```
   List<FacetResult> expected = new ArrayList<>();
       for (int i = 0; i < numDims; i++) {
         List<LabelAndValue> labelValues = new ArrayList<>();
         float aggregatedValue = 0;
         for (Map.Entry<String, Float> ent : expectedValues[i].entrySet()) {
           if(ent.getValue() > 0) {
             labelValues.add(new LabelAndValue(ent.getKey(), ent.getValue()));
             aggregatedValue = aggregationFunction.aggregate(aggregatedValue, 
ent.getValue());
           }
         }
   ```


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