restrict access modifier in IpFieldMapper (opensearch-project#19077)

Signed-off-by: Sandesh Kumar <sandeshkr419@gmail.com>

Author: sandeshkr419

server/src/main/java/org/opensearch/index/mapper/IpFieldMapper.java

@@ -237,7 +237,7 @@ public String typeName() {
             return CONTENT_TYPE;
         }
 
-        public static InetAddress parse(Object value) {
+        private static InetAddress parse(Object value) {
             if (value instanceof InetAddress) {
                 return (InetAddress) value;
             } else {

server/src/main/java/org/opensearch/search/startree/StarTreeQueryHelper.java

@@ -47,8 +47,6 @@
  */
 public class StarTreeQueryHelper {
 
-    private static StarTreeValues starTreeValues;
-
     /**
      * Checks if the search context can be supported by star-tree
      */
@@ -63,10 +61,9 @@ public static CompositeIndexFieldInfo getSupportedStarTree(QueryShardContext con
 
     public static StarTreeValues getStarTreeValues(LeafReaderContext context, CompositeIndexFieldInfo starTree) throws IOException {
         SegmentReader reader = Lucene.segmentReader(context.reader());
-        if (!(reader.getDocValuesReader() instanceof CompositeIndexReader)) {
+        if (!(reader.getDocValuesReader() instanceof CompositeIndexReader starTreeDocValuesReader)) {
             return null;
         }
-        CompositeIndexReader starTreeDocValuesReader = (CompositeIndexReader) reader.getDocValuesReader();
         return (StarTreeValues) starTreeDocValuesReader.getCompositeIndexValues(starTree);
     }