Index: lucene/misc/src/java/org/apache/lucene/index/sorter/Sorter.java
===================================================================
--- lucene/misc/src/java/org/apache/lucene/index/sorter/Sorter.java	(revision 1466166)
+++ lucene/misc/src/java/org/apache/lucene/index/sorter/Sorter.java	(working copy)
@@ -81,6 +81,47 @@
 
   }
 
+  /** Sorts documents in reverse order of a wrapped {@link Sorter}. */
+  public static final class ReverseOrderSorter extends Sorter {
+
+    private final Sorter in;
+    
+    public ReverseOrderSorter(Sorter in) {
+      if (in == REVERSE_DOCS || in instanceof ReverseOrderSorter) {
+        throw new IllegalArgumentException("reversing the order of a reversing sorter doesn't make any sense!");
+      }
+      this.in = in;
+    }
+    
+    @Override
+    public DocMap sort(final AtomicReader reader) throws IOException {
+      final int maxDoc = reader.maxDoc();
+      final DocMap inMap = in.sort(reader);
+      return new DocMap() {
+        @Override
+        public int oldToNew(int docID) {
+          return maxDoc - inMap.oldToNew(docID) - 1;
+        }
+        
+        @Override
+        public int newToOld(int docID) {
+          return inMap.newToOld(maxDoc - docID -1);
+        }
+        
+        @Override
+        public int size() {
+          return inMap.size();
+        }
+        
+      };
+    }
+    
+    @Override
+    public String getID() {
+      return "Reverse(" + in.getID() + ")";
+    }
+  }
+
   /** Sorts documents in reverse order.
    *  <b>NOTE</b>: This {@link Sorter} is not idempotent. Sorting an
    *  {@link AtomicReader} once or twice will return two different
@@ -111,7 +152,7 @@
       return "ReverseDocs";
     }
   };
-
+  
   private static final class DocValueSorterTemplate extends SorterTemplate {
     
     private final int[] docs;
Index: lucene/misc/src/test/org/apache/lucene/index/sorter/IndexSortingTest.java
===================================================================
--- lucene/misc/src/test/org/apache/lucene/index/sorter/IndexSortingTest.java	(revision 1466166)
+++ lucene/misc/src/test/org/apache/lucene/index/sorter/IndexSortingTest.java	(working copy)
@@ -52,6 +52,10 @@
       Collections.reverse(values);
     } else {
       Collections.sort(values);
+      if (random().nextBoolean()) {
+        sorter = new Sorter.ReverseOrderSorter(sorter);
+        Collections.reverse(values);
+      }
     }
     sortedValues = values.toArray(new Integer[values.size()]);
     if (VERBOSE) {