CBQE-2495: update index tests

Change-Id: Ic59f2275a6da6dc9637c84e927e5a0cb83487ea2
Reviewed-on: http://review.couchbase.org/44427
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>