CBQE-1835: fix big data test for queries

Change-Id: Ia7881b073705eb7be4e5f46f7a68ca558f2334e2
Reviewed-on: http://review.couchbase.org/31716
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>