[LUCENE-4345] - adding kNN score as count / k but no need to retrieve it from the map

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1403799 13f79535-47bb-0310-9956-ffa450edef68

lucene/classification/src/java/org/apache/lucene/classification/KNearestNeighborClassifier.java

@@ -77,7 +77,7 @@ public class KNearestNeighborClassifier implements Classifier {
         assignedClass = cl;
       }
     }
-    double score = classCounts.get(assignedClass) / k;
+    double score = max / k;
     return new ClassificationResult(assignedClass, score);
   }