fix annotation position

Author: SylvainJuge

instrumentation/elasticsearch/elasticsearch-transport-5.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/elasticsearch/transport/v5_0/AbstractClientInstrumentation.java

@@ -64,7 +64,8 @@ private AdviceScope(
         this.scope = scope;
       }
 
-      public static @Nullable AdviceScope start(ElasticTransportRequest request) {
+      @Nullable
+      public static AdviceScope start(ElasticTransportRequest request) {
         Context parentContext = currentContext();
         if (!instrumenter().shouldStart(parentContext, request)) {
           return null;