add conf file for n1ql index

Change-Id: I9976ac2af0cc6244d69091704575b521a0146154
Reviewed-on: http://review.couchbase.org/44425
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>