change elasticsearch repo to upstream
diff --git a/linux/system/repo/elasticsearch.yml b/linux/system/repo/elasticsearch.yml
index 6758f6d..60f6fd0 100644
--- a/linux/system/repo/elasticsearch.yml
+++ b/linux/system/repo/elasticsearch.yml
@@ -2,7 +2,7 @@
   linux:
     system:
       repo:
-        tcpcloud_elasticsearch:
-          source: "deb [arch=amd64] http://apt.tcpcloud.eu/nightly/ xenial elastic"
+        elasticsearch:
+          source: "deb http://packages.elastic.co/elasticsearch/2.x/debian stable main"
           architectures: amd64
-          key_url: "http://apt.tcpcloud.eu/public.gpg"
\ No newline at end of file
+          key_url: "https://packages.elastic.co/GPG-KEY-elasticsearch"
\ No newline at end of file