Trim to size lists created in source fetchers

Author: iverase

server/src/main/java/org/elasticsearch/index/mapper/ArraySourceValueFetcher.java

@@ -56,7 +56,7 @@ public ArraySourceValueFetcher(Set<String> sourcePaths, Object nullValue) {
 
     @Override
     public List<Object> fetchValues(Source source, int doc, List<Object> ignoredValues) {
-        List<Object> values = new ArrayList<>();
+        ArrayList<Object> values = new ArrayList<>();
         for (String path : sourcePaths) {
             Object sourceValue = source.extractValue(path, nullValue);
             if (sourceValue == null) {
@@ -70,6 +70,7 @@ public List<Object> fetchValues(Source source, int doc, List<Object> ignoredValu
                 ignoredValues.add(sourceValue);
             }
         }
+        values.trimToSize();
         return values;
     }
 

server/src/main/java/org/elasticsearch/index/mapper/SourceValueFetcher.java

@@ -55,7 +55,7 @@ public SourceValueFetcher(Set<String> sourcePaths, Object nullValue) {
 
     @Override
     public List<Object> fetchValues(Source source, int doc, List<Object> ignoredValues) {
-        List<Object> values = new ArrayList<>();
+        ArrayList<Object> values = new ArrayList<>();
         for (String path : sourcePaths) {
             Object sourceValue = source.extractValue(path, nullValue);
             if (sourceValue == null) {
@@ -92,6 +92,7 @@ public List<Object> fetchValues(Source source, int doc, List<Object> ignoredValu
                 }
             }
         }
+        values.trimToSize();
         return values;
     }