Couchbase documentation : searching is now a lot cumbersome with Google custom search rendered useless

There seem to be only 7-8 items indexed for Google custom search.

Couchbase Administrator Guide
couchbase-manual-2.2
Couchbase Server Release Notes
docs.couchbase.com/couchbase-manual-2.5/cb-release-notes/
docs.couchbase.com/couchbase-manual-2.5/cb-rest-api/
Couchbase Lite iOS Guide
Couchbase Lite Android Guide
couchbase-manual-1.8 - Couchbase Documentation Center

Regardless of the keyword searched for, these are the only results I see (both on Google web search and site search).

Clicking on them only takes a user to the corresponding manual's introduction section. One is left at the mercy of browser's search to fish out the keyword(half the users won't even go that far!). When you are searching for some specific information, the index panel on the left isn't very useful either.

Why is there no indexing on topics? Good user-experience is something that provides the user the info he's looking for with a single click.