Compress elasticsearch stored fields.

Configure elasticsearch to compress stored fields and the term vector.

Change-Id: Ic7f40e18fc950056abd84e083b5d9abb69e38dbe
Reviewed-on: https://review.openstack.org/21138
Reviewed-by: Paul Belanger <paul.belanger@polybeacon.com>
Reviewed-by: Khai Do <zaro0508@gmail.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins