Mount elasticsearch glusterfs volume as 1000:1000

After switching at the upstream image which have uid:gid for the
container user, the definition of mounting volume was not updated.

Change-Id: I4ab26e6ce6814fbb7bba1612ece59a9f7205a385
diff --git a/glusterfs/client/volume/elasticsearch.yml b/glusterfs/client/volume/elasticsearch.yml
index 0248093..2ebfcfc 100644
--- a/glusterfs/client/volume/elasticsearch.yml
+++ b/glusterfs/client/volume/elasticsearch.yml
@@ -11,3 +11,5 @@
           path: /srv/volumes/elasticsearch
           server: ${_param:elasticsearch_glusterfs_service_host}
           opts: "defaults,backup-volfile-servers=${_param:glusterfs_node01_address}:${_param:glusterfs_node02_address}:${_param:glusterfs_node03_address}"
+          user: 1000
+          group: 1000