Pass baseSimilarity to super (PerFieldSimilarityWrapper)

Author: mikemccand

core/src/main/java/org/elasticsearch/index/similarity/SimilarityService.java

@@ -128,12 +128,11 @@ Similarity getDefaultSimilarity() {
     static class PerFieldSimilarity extends PerFieldSimilarityWrapper {
 
         private final Similarity defaultSimilarity;
-        private final Similarity baseSimilarity;
         private final MapperService mapperService;
 
         PerFieldSimilarity(Similarity defaultSimilarity, Similarity baseSimilarity, MapperService mapperService) {
+            super(baseSimilarity);
             this.defaultSimilarity = defaultSimilarity;
-            this.baseSimilarity = baseSimilarity;
             this.mapperService = mapperService;
         }