Make SegmentHandoffNotifier Closeable.

indexing-service/src/test/java/io/druid/indexing/common/task/RealtimeIndexTaskTest.java

@@ -1005,7 +1005,7 @@ public class RealtimeIndexTaskTest
           }
 
           @Override
-          public void stop()
+          public void close()
           {
             //Noop
           }

indexing-service/src/test/java/io/druid/indexing/overlord/TaskLifecycleTest.java

@@ -451,7 +451,7 @@ public class TaskLifecycleTest
           }
 
           @Override
-          public void stop()
+          public void close()
           {
             //Noop
           }

server/src/main/java/io/druid/segment/realtime/plumber/CoordinatorBasedSegmentHandoffNotifier.java

@@ -159,7 +159,7 @@ public class CoordinatorBasedSegmentHandoffNotifier implements SegmentHandoffNot
   }
 
   @Override
-  public void stop()
+  public void close()
   {
     scheduledExecutor.shutdown();
   }

server/src/main/java/io/druid/segment/realtime/plumber/RealtimePlumber.java

@@ -651,7 +651,7 @@ public class RealtimePlumber implements Plumber
       }
     }
 
-    handoffNotifier.stop();
+    handoffNotifier.close();
     shutdownExecutors();
 
     stopped = true;

server/src/main/java/io/druid/segment/realtime/plumber/SegmentHandoffNotifier.java

@@ -21,9 +21,10 @@ package io.druid.segment.realtime.plumber;
 
 import io.druid.query.SegmentDescriptor;
 
+import java.io.Closeable;
 import java.util.concurrent.Executor;
 
-public interface SegmentHandoffNotifier
+public interface SegmentHandoffNotifier extends Closeable
 {
   /**
    * register a handOffCallback to be called when segment handoff is complete.
@@ -47,6 +48,6 @@ public interface SegmentHandoffNotifier
   /**
    * Perform any final processing and clean up after ourselves.
    */
-  void stop();
+  void close();
 
 }