From 7f048c5e8bd952ef0b5b41d332b281b645f4a4cb Mon Sep 17 00:00:00 2001
From: Geoff Bourne <itzgeoff@gmail.com>
Date: Fri, 24 Jul 2015 12:49:57 -0400
Subject: [PATCH] [es] Adding CLUSTER_FROM feature for migrating cluster data
 directories

---
 elasticsearch/start | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/elasticsearch/start b/elasticsearch/start
index 3f60149b..154f9e98 100755
--- a/elasticsearch/start
+++ b/elasticsearch/start
@@ -20,6 +20,12 @@ OPTS="-Des.path.conf=/conf \
 
 if [ -n "$CLUSTER" ]; then
   OPTS="$OPTS -Des.cluster.name=$CLUSTER"
+  if [ -n "$CLUSTER_FROM" ]; then
+    if [ -d /data/$CLUSTER_FROM -a ! -d /data/$CLUSTER ]; then
+      echo "Performing cluster data migration from $CLUSTER_FROM to $CLUSTER"
+      mv /data/$CLUSTER_FROM /data/$CLUSTER
+    fi
+  fi
 fi
 
 if [ -n "$NODE_NAME" ]; then