diff --git a/core/src/test/java/org/elasticsearch/indices/cluster/AbstractIndicesClusterStateServiceTestCase.java b/core/src/test/java/org/elasticsearch/indices/cluster/AbstractIndicesClusterStateServiceTestCase.java
index 69bee510710..4bf12bd9138 100644
--- a/core/src/test/java/org/elasticsearch/indices/cluster/AbstractIndicesClusterStateServiceTestCase.java
+++ b/core/src/test/java/org/elasticsearch/indices/cluster/AbstractIndicesClusterStateServiceTestCase.java
@@ -181,7 +181,8 @@ public abstract class AbstractIndicesClusterStateServiceTestCase extends ESTestC
         }
 
         @Override
-        public @Nullable MockIndexService indexService(Index index) {
+        @Nullable
+        public MockIndexService indexService(Index index) {
             return indices.get(index.getUUID());
         }