diff --git a/.idea/libraries/jgroups.xml b/.idea/libraries/jgroups.xml
index 8467733db7a..5ac32951af5 100644
--- a/.idea/libraries/jgroups.xml
+++ b/.idea/libraries/jgroups.xml
@@ -1,11 +1,9 @@
 <component name="libraryTable">
   <library name="jgroups">
     <CLASSES>
-      <root url="jar://$GRADLE_REPOSITORY$/jgroups/jgroups/jars/jgroups-2.8.0.GA.jar!/" />
+      <root url="jar://$GRADLE_REPOSITORY$/jgroups/jgroups/jars/jgroups-2.9.0.GA.jar!/" />
     </CLASSES>
     <JAVADOC />
-    <SOURCES>
-      <root url="file://$PROJECT_DIR$/../../../opt/jgroups/2.8.0.GA.src/src" />
-    </SOURCES>
+    <SOURCES />
   </library>
 </component>
\ No newline at end of file
diff --git a/modules/elasticsearch/build.gradle b/modules/elasticsearch/build.gradle
index 62c9c1e8705..7a2c0a9ad6f 100644
--- a/modules/elasticsearch/build.gradle
+++ b/modules/elasticsearch/build.gradle
@@ -50,7 +50,7 @@ dependencies {
     compile 'org.apache.lucene:lucene-analyzers:3.0.0'
     compile 'org.apache.lucene:lucene-queries:3.0.0'
 
-    compile('jgroups:jgroups:2.8.0.GA') { transitive = false }
+    compile('jgroups:jgroups:2.9.0.GA') { transitive = false }
     compile('org.jboss.netty:netty:3.1.5.GA') { transitive = false }
 
     testCompile project(':test-testng')
diff --git a/modules/elasticsearch/src/main/java/config/jgroups/tcp-nio.xml b/modules/elasticsearch/src/main/java/config/jgroups/tcp-nio.xml
index c71406eb511..4e3d04c812b 100644
--- a/modules/elasticsearch/src/main/java/config/jgroups/tcp-nio.xml
+++ b/modules/elasticsearch/src/main/java/config/jgroups/tcp-nio.xml
@@ -7,6 +7,8 @@
     multicasting cannot be used in a network, e.g. because it is disabled (routers discard multicast).
     Note that TCP.bind_addr and TCPPING.initial_hosts should be set, possibly via system properties, e.g.
     -Djgroups.bind_addr=192.168.5.2 and -Djgroups.tcpping.initial_hosts=192.168.5.2[7800]".
+    author: Bela Ban
+    version: $Id: tcp-nio.xml,v 1.19 2009/12/11 10:45:19 belaban Exp $
 -->
 <config xmlns="urn:org:jgroups"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
@@ -22,7 +24,6 @@
             enable_bundling="true"
             use_send_queues="true"
             sock_conn_timeout="300"
-            skip_suspected_members="true"
 
             thread_pool.enabled="true"
             thread_pool.min_threads="1"
diff --git a/modules/elasticsearch/src/main/java/config/jgroups/tcp.xml b/modules/elasticsearch/src/main/java/config/jgroups/tcp.xml
index 02d60d70af7..4e22fe170e0 100644
--- a/modules/elasticsearch/src/main/java/config/jgroups/tcp.xml
+++ b/modules/elasticsearch/src/main/java/config/jgroups/tcp.xml
@@ -7,22 +7,23 @@
     multicasting cannot be used in a network, e.g. because it is disabled (routers discard multicast).
     Note that TCP.bind_addr and TCPPING.initial_hosts should be set, possibly via system properties, e.g.
     -Djgroups.bind_addr=192.168.5.2 and -Djgroups.tcpping.initial_hosts=192.168.5.2[7800]
+    author: Bela Ban
+    version: $Id: tcp.xml,v 1.40 2009/12/18 09:28:30 belaban Exp $
 -->
 <config xmlns="urn:org:jgroups"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/JGroups-2.8.xsd">
     <TCP bind_port="7800"
          loopback="true"
-         recv_buf_size="${tcp.recv_buf_size:20000000}"
-         send_buf_size="${tcp.send_buf_size:640000}"
+         recv_buf_size="${tcp.recv_buf_size:20M}"
+         send_buf_size="${tcp.send_buf_size:640K}"
          discard_incompatible_packets="true"
-         max_bundle_size="64000"
+         max_bundle_size="64K"
          max_bundle_timeout="30"
          enable_bundling="true"
          use_send_queues="true"
          sock_conn_timeout="300"
-         skip_suspected_members="true"
-         num_timer_threads="4"
+         timer.num_threads="4"
 
          thread_pool.enabled="true"
          thread_pool.min_threads="1"
@@ -56,13 +57,13 @@
             discard_delivered_msgs="true"/>
     <UNICAST timeout="300,600,1200"/>
     <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000"
-                   max_bytes="400000"/>
+                   max_bytes="400K"/>
     <pbcast.GMS print_local_addr="false" join_timeout="3000"
 
                 view_bundling="true"/>
-    <FC max_credits="2000000"
+    <FC max_credits="2M"
         min_threshold="0.10"/>
-    <FRAG2 frag_size="60000"/>
+    <FRAG2 frag_size="60K"/>
     <!--<pbcast.STREAMING_STATE_TRANSFER/>-->
     <!-- <pbcast.STATE_TRANSFER/> -->
-</config>
\ No newline at end of file
+</config>
diff --git a/modules/elasticsearch/src/main/java/config/jgroups/tcpgossip.xml b/modules/elasticsearch/src/main/java/config/jgroups/tcpgossip.xml
index ad87ae618bd..937e9306a16 100644
--- a/modules/elasticsearch/src/main/java/config/jgroups/tcpgossip.xml
+++ b/modules/elasticsearch/src/main/java/config/jgroups/tcpgossip.xml
@@ -1,3 +1,6 @@
+<!-- Changes from default jgroups tcp.xml: -->
+<!-- 1. Changed print_local_addr from true to false -->
+
 <!-- ************ JGroups Protocol Stack Configuration ************** -->
 <!-- generated by XmlConfigurator on Mon Apr 26 11:26:18 PDT 2004 -->
 <!-- input file: tcpgossip.old.xml -->
@@ -6,7 +9,7 @@
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/JGroups-2.8.xsd">
     <TCP bind_port="7800" bind_addr="localhost" loopback="true"/>
-    <TCPGOSSIP timeout="3000" initial_hosts="localhost[12000]" num_initial_members="3"/>
+    <TCPGOSSIP timeout="3000" initial_hosts="localhost[12001]" num_initial_members="3"/>
     <MERGE2 max_interval="30000"
             min_interval="10000"/>
     <FD timeout="2000" max_tries="4"/>
@@ -14,7 +17,7 @@
     <pbcast.NAKACK gc_lag="100" retransmit_timeout="600,1200,2400,4800"/>
     <UNICAST timeout="300,600,1200"/>
     <pbcast.STABLE stability_delay="1000" desired_avg_gossip="20000" max_bytes="0"/>
-    <pbcast.GMS print_local_addr="true" join_timeout="5000"/>
+    <pbcast.GMS print_local_addr="false" join_timeout="5000"/>
     <FC max_credits="2000000"
         min_threshold="0.10"/>
     <FRAG2 frag_size="60000"/>
diff --git a/modules/elasticsearch/src/main/java/config/jgroups/udp.xml b/modules/elasticsearch/src/main/java/config/jgroups/udp.xml
index a8b232210d8..cc1bd717c3e 100644
--- a/modules/elasticsearch/src/main/java/config/jgroups/udp.xml
+++ b/modules/elasticsearch/src/main/java/config/jgroups/udp.xml
@@ -1,30 +1,33 @@
 <!-- Changes from default jgroups udp.xml: -->
 <!-- 1. Changed print_local_addr from true to false -->
-<!-- 2. Disabled STREAMING_STATE_TRANSFER, we don't use it -->
+<!-- 2. Disabled STATE_TRANSFER, we don't use it -->
 
 <!--
   Default stack using IP multicasting. It is similar to the "udp"
   stack in stacks.xml, but doesn't use streaming state transfer and flushing
+  author: Bela Ban
+  version: $Id: udp.xml,v 1.40 2010/02/08 07:11:15 belaban Exp $
 -->
+
 <config xmlns="urn:org:jgroups"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/JGroups-2.8.xsd">
     <UDP
             mcast_port="${jgroups.udp.mcast_port:45588}"
             tos="8"
-            ucast_recv_buf_size="20000000"
-            ucast_send_buf_size="640000"
-            mcast_recv_buf_size="25000000"
-            mcast_send_buf_size="640000"
-            loopback="false"
+            ucast_recv_buf_size="20M"
+            ucast_send_buf_size="640K"
+            mcast_recv_buf_size="25M"
+            mcast_send_buf_size="640K"
+            loopback="true"
             discard_incompatible_packets="true"
-            max_bundle_size="64000"
+            max_bundle_size="64K"
             max_bundle_timeout="30"
             ip_ttl="${jgroups.udp.ip_ttl:2}"
             enable_bundling="true"
             enable_diagnostics="true"
             thread_naming_pattern="cl"
-            num_timer_threads="4"
+            timer.num_threads="4"
 
             thread_pool.enabled="true"
             thread_pool.min_threads="2"
@@ -57,14 +60,14 @@
                    discard_delivered_msgs="true"/>
     <UNICAST timeout="300,600,1200"/>
     <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000"
-                   max_bytes="1000000"/>
+                   max_bytes="1M"/>
     <pbcast.GMS print_local_addr="false" join_timeout="3000"
 
                 view_bundling="true"/>
-    <FC max_credits="500000"
+    <FC max_credits="500K"
         min_threshold="0.20"/>
-    <FRAG2 frag_size="60000"/>
+    <FRAG2 frag_size="60K"/>
     <!--pbcast.STREAMING_STATE_TRANSFER /-->
-    <!--<pbcast.STATE_TRANSFER/>-->
+    <!--<pbcast.STATE_TRANSFER  />-->
     <!-- pbcast.FLUSH  /-->
 </config>
diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/discovery/jgroups/JgroupsDiscovery.java b/modules/elasticsearch/src/main/java/org/elasticsearch/discovery/jgroups/JgroupsDiscovery.java
index 4d1129a72c6..fadcb9eb57a 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/discovery/jgroups/JgroupsDiscovery.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/discovery/jgroups/JgroupsDiscovery.java
@@ -29,7 +29,6 @@ import org.elasticsearch.discovery.Discovery;
 import org.elasticsearch.discovery.DiscoveryException;
 import org.elasticsearch.discovery.InitialStateDiscoveryListener;
 import org.elasticsearch.env.Environment;
-import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 import org.elasticsearch.util.component.AbstractComponent;
 import org.elasticsearch.util.component.Lifecycle;
@@ -66,8 +65,6 @@ public class JgroupsDiscovery extends AbstractComponent implements Discovery, Re
 
     private final ClusterName clusterName;
 
-    private final ThreadPool threadPool;
-
     private final TransportService transportService;
 
     private final ClusterService clusterService;
@@ -85,10 +82,9 @@ public class JgroupsDiscovery extends AbstractComponent implements Discovery, Re
     private final CopyOnWriteArrayList<InitialStateDiscoveryListener> initialStateListeners = new CopyOnWriteArrayList<InitialStateDiscoveryListener>();
 
     @Inject public JgroupsDiscovery(Settings settings, Environment environment, ClusterName clusterName,
-                                    ThreadPool threadPool, TransportService transportService, ClusterService clusterService) {
+                                    TransportService transportService, ClusterService clusterService) {
         super(settings);
         this.clusterName = clusterName;
-        this.threadPool = threadPool;
         this.transportService = transportService;
         this.clusterService = clusterService;