Ensure to access to Advisor and Explain service

[giallon]

Advisor and Explain is the service to help developer to write better request N1QL and create a good index with it.

https://docs.couchbase.com/server/current/guides/index-advisor.html
https://docs.couchbase.com/server/current/n1ql/n1ql-language-reference/explain.html