lowering log level at ClusterCommunicationManager

Change-Id: I28c51cf865d790c5558f4d9684c9b4d25262d2b2
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java
index c7852ae..30465ac 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java
@@ -114,7 +114,7 @@
                     message.subject().value(), SERIALIZER.encode(message));
             return true;
         } catch (IOException e) {
-            log.error("Failed to send cluster message to nodeId: " + toNodeId, e);
+            log.trace("Failed to send cluster message to nodeId: " + toNodeId, e);
             throw e;
         }
     }