Views are used directly execute from SDKs. cc @Siri
Views : https://developer.couchbase.com/documentation/server/3.x/admin/Views/views-intro.html
If you are using new project you should explore N1QL+GSI index.
https://developer.couchbase.com/documentation/server/5.1/indexes/indexing-overview.html
https://developer.couchbase.com/documentation/server/5.1/n1ql/n1ql-language-reference/index.html