diff --git a/pom.xml b/pom.xml
index f61ec34b1d13a..78970ac3b1f97 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1002,7 +1002,7 @@
             <plugin>
                 <groupId>de.thetaphi</groupId>
                 <artifactId>forbiddenapis</artifactId>
-                <version>1.4</version>
+                <version>1.4.1</version>
 
                 <executions>
                     <execution>
diff --git a/src/test/java/org/elasticsearch/benchmark/search/aggregations/TermsAggregationSearchBenchmark.java b/src/test/java/org/elasticsearch/benchmark/search/aggregations/TermsAggregationSearchBenchmark.java
index c12f24f06d192..53887fb8a7941 100644
--- a/src/test/java/org/elasticsearch/benchmark/search/aggregations/TermsAggregationSearchBenchmark.java
+++ b/src/test/java/org/elasticsearch/benchmark/search/aggregations/TermsAggregationSearchBenchmark.java
@@ -38,6 +38,7 @@
 import org.elasticsearch.search.aggregations.AggregationBuilders;
 
 import java.util.List;
+import java.util.Locale;
 import java.util.Random;
 
 import static org.elasticsearch.client.Requests.createIndexRequest;
@@ -266,9 +267,9 @@ public static void main(String[] args) throws Exception {
         stats.add(termsStats("terms_stats_agg_sm_l_dv", Method.AGGREGATION, "sm_value_dv", "l_value_dv", null));
 
         System.out.println("------------------ SUMMARY -------------------------------");
-        System.out.format("%25s%10s%10s\n", "name", "took", "millis");
+        System.out.format(Locale.ENGLISH, "%25s%10s%10s\n", "name", "took", "millis");
         for (StatsResult stat : stats) {
-            System.out.format("%25s%10s%10d\n", stat.name, TimeValue.timeValueMillis(stat.took), (stat.took / QUERY_COUNT));
+            System.out.format(Locale.ENGLISH, "%25s%10s%10d\n", stat.name, TimeValue.timeValueMillis(stat.took), (stat.took / QUERY_COUNT));
         }
         System.out.println("------------------ SUMMARY -------------------------------");
 
diff --git a/src/test/java/org/elasticsearch/search/aggregations/metrics/GroupTree.java b/src/test/java/org/elasticsearch/search/aggregations/metrics/GroupTree.java
index 44e00a064bf83..7864415142788 100644
--- a/src/test/java/org/elasticsearch/search/aggregations/metrics/GroupTree.java
+++ b/src/test/java/org/elasticsearch/search/aggregations/metrics/GroupTree.java
@@ -22,10 +22,7 @@
 import com.google.common.collect.AbstractIterator;
 import com.google.common.collect.Lists;
 
-import java.util.ArrayDeque;
-import java.util.Deque;
-import java.util.Iterator;
-import java.util.List;
+import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
@@ -366,10 +363,10 @@ public void checkBalance() {
 
     public void print(int depth) {
         for (int i = 0; i < depth; i++) {
-            System.out.printf("| ");
+            System.out.print("| ");
         }
         int imbalance = Math.abs((left != null ? left.depth : 1) - (right != null ? right.depth : 1));
-        System.out.printf("%s%s, %d, %d, %d\n", (imbalance > 1 ? "* " : "") + (right != null && leaf.compareTo(right.first()) != 0 ? "+ " : ""), leaf, size, count, this.depth);
+        System.out.printf(Locale.ENGLISH, "%s%s, %d, %d, %d\n", (imbalance > 1 ? "* " : "") + (right != null && leaf.compareTo(right.first()) != 0 ? "+ " : ""), leaf, size, count, this.depth);
         if (left != null) {
             left.print(depth + 1);
             right.print(depth + 1);