add static close methods to main class entry point

modules/elasticsearch/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java

@@ -57,9 +57,10 @@ public class Bootstrap {
     private Node node;
 
     private static volatile Thread keepAliveThread;
-
     private static volatile CountDownLatch keepAliveLatch;
 
+    private static Bootstrap bootstrap;
+
     private void setup(boolean addShutdownHook, Tuple<Settings, Environment> tuple) throws Exception {
 //        Loggers.getLogger(Bootstrap.class, tuple.v1().get("name")).info("heap_size {}/{}", JvmStats.jvmStats().mem().heapCommitted(), JvmInfo.jvmInfo().mem().heapMax());
         if (tuple.v1().getAsBoolean("bootstrap.mlockall", false)) {
@@ -137,10 +138,14 @@ public class Bootstrap {
         node.close();
     }
 
+    public static void close(String[] args) {
+        bootstrap.destroy();
+        keepAliveLatch.countDown();
+    }
 
     public static void main(String[] args) {
         System.setProperty("es.logger.prefix", "");
-        Bootstrap bootstrap = new Bootstrap();
+        bootstrap = new Bootstrap();
         String pidFile = System.getProperty("es-pidfile");
 
         // enable jline by default when running form "main" (and not on windows)

modules/elasticsearch/src/main/java/org/elasticsearch/bootstrap/ElasticSearch.java

@@ -24,6 +24,10 @@ package org.elasticsearch.bootstrap;
  */
 public class ElasticSearch extends Bootstrap {
 
+    public static void close(String[] args) {
+        Bootstrap.close(args);
+    }
+
     public static void main(String[] args) {
         Bootstrap.main(args);
     }