Cover index for union and order by condition


I have query like this:

Can you suggest are there anyway to create a cover index for this to speed up fetching time ?


CREATE INDEX news_type_cate_all2_idx ON News(newsType,cate,dateTimeCreated DESC,parent_cate, alias,content) WHERE (type = “News”)

Checkout Designing Index For Query In Couchbase N1QL in