diff --git a/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/DoubleHyperRectangle.java b/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/DoubleHyperRectangle.java
index e1db9cb250d3..1b61d75dd7ad 100644
--- a/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/DoubleHyperRectangle.java
+++ b/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/DoubleHyperRectangle.java
@@ -24,10 +24,10 @@ public class DoubleHyperRectangle extends HyperRectangle {
 
   /** Creates DoubleHyperRectangle */
   public DoubleHyperRectangle(String label, DoubleRangePair... pairs) {
-    super(label, convertToLongRangePairArray(pairs));
+    super(label, convertToLongRangePairs(pairs));
   }
 
-  private static LongRangePair[] convertToLongRangePairArray(DoubleRangePair... pairs) {
+  private static LongRangePair[] convertToLongRangePairs(DoubleRangePair... pairs) {
     if (pairs == null || pairs.length == 0) {
       throw new IllegalArgumentException("Pairs cannot be null or empty");
     }
@@ -62,12 +62,12 @@ public DoubleRangePair(double minIn, boolean minInclusive, double maxIn, boolean
       }
 
       if (!maxInclusive) {
-        // Why no Math.nextDown?
-        maxIn = Math.nextAfter(maxIn, Double.NEGATIVE_INFINITY);
+        maxIn = Math.nextDown(maxIn);
       }
 
       if (minIn > maxIn) {
-        throw new IllegalArgumentException("Minimum cannot be greater than maximum");
+        throw new IllegalArgumentException(
+            "Minimum cannot be greater than maximum, max=" + maxIn + ", min=" + minIn);
       }
 
       this.min = minIn;
diff --git a/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangle.java b/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangle.java
index 5280df0584be..3bfe6f3edfc5 100644
--- a/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangle.java
+++ b/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangle.java
@@ -85,7 +85,8 @@ public LongRangePair(long minIn, boolean minInclusive, long maxIn, boolean maxIn
       }
 
       if (minIn > maxIn) {
-        throw new IllegalArgumentException("Minimum cannot be greater than maximum");
+        throw new IllegalArgumentException(
+            "Minimum cannot be greater than maximum, max=" + maxIn + ", min=" + minIn);
       }
 
       this.min = minIn;
diff --git a/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangleFacetCounts.java b/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangleFacetCounts.java
index 40380b29cfb0..123322db5e62 100644
--- a/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangleFacetCounts.java
+++ b/lucene/facet/src/java/org/apache/lucene/facet/hyperrectangle/HyperRectangleFacetCounts.java
@@ -47,38 +47,17 @@ public class HyperRectangleFacetCounts extends Facets {
   protected int totCount;
 
   /**
-   * Create HyperRectangleFacetCounts using
+   * Create HyperRectangleFacetCounts using this
    *
    * @param field Field name
    * @param hits Hits to facet on
-   * @param hyperRectangles List of long hyper rectangle facets
+   * @param hyperRectangles List of hyper rectangle facets
    * @throws IOException If there is a problem reading the field
    */
   public HyperRectangleFacetCounts(
-      String field, FacetsCollector hits, LongHyperRectangle... hyperRectangles)
-      throws IOException {
-    this(true, field, hits, hyperRectangles);
-  }
-
-  /**
-   * Create HyperRectangleFacetCounts using
-   *
-   * @param field Field name
-   * @param hits Hits to facet on
-   * @param hyperRectangles List of double hyper rectangle facets
-   * @throws IOException If there is a problem reading the field
-   */
-  public HyperRectangleFacetCounts(
-      String field, FacetsCollector hits, DoubleHyperRectangle... hyperRectangles)
-      throws IOException {
-    this(true, field, hits, hyperRectangles);
-  }
-
-  private HyperRectangleFacetCounts(
-      boolean discarded, String field, FacetsCollector hits, HyperRectangle... hyperRectangles)
-      throws IOException {
+      String field, FacetsCollector hits, HyperRectangle... hyperRectangles) throws IOException {
     assert hyperRectangles.length > 0 : "Hyper rectangle ranges cannot be empty";
-    assert isHyperRectangleDimsConsistent(hyperRectangles)
+    assert areHyperRectangleDimsConsistent(hyperRectangles)
         : "All hyper rectangles must be the same dimensionality";
     this.field = field;
     this.hyperRectangles = hyperRectangles;
@@ -87,7 +66,7 @@ assert isHyperRectangleDimsConsistent(hyperRectangles)
     count(field, hits.getMatchingDocs());
   }
 
-  private boolean isHyperRectangleDimsConsistent(HyperRectangle[] hyperRectangles) {
+  private boolean areHyperRectangleDimsConsistent(HyperRectangle[] hyperRectangles) {
     int dims = hyperRectangles[0].dims;
     return Arrays.stream(hyperRectangles).allMatch(hyperRectangle -> hyperRectangle.dims == dims);
   }
@@ -107,7 +86,7 @@ private void count(String field, List<FacetsCollector.MatchingDocs> matchingDocs
         continue;
       }
 
-      for (int doc = it.nextDoc(); doc != DocIdSetIterator.NO_MORE_DOCS; ) {
+      for (int doc = it.nextDoc(); doc != DocIdSetIterator.NO_MORE_DOCS; doc = it.nextDoc()) {
         if (binaryDocValues.advanceExact(doc)) {
           long[] point = LongPoint.unpack(binaryDocValues.binaryValue());
           assert point.length == dims
@@ -136,7 +115,6 @@ private void count(String field, List<FacetsCollector.MatchingDocs> matchingDocs
             totCount++;
           }
         }
-        doc = it.nextDoc();
       }
     }
   }
@@ -148,7 +126,7 @@ public FacetResult getTopChildren(int topN, String dim, String... path) throws I
       throw new IllegalArgumentException(
           "invalid dim \"" + dim + "\"; should be \"" + field + "\"");
     }
-    if (path.length != 0) {
+    if (path != null && path.length != 0) {
       throw new IllegalArgumentException("path.length should be 0");
     }
     LabelAndValue[] labelValues = new LabelAndValue[counts.length];