Elevation #
To promote certain results over others, you can use Elevation (currently a work in progress).
Why use elevation? #
If you need to put a certain page above another for certain search queries, you should use elevation. It is similar to boosting, but for a result rather than a field.
An example of this is an e-commerce store. As a shop, you want the product pages themselves to appear above the warranty pages, even if they have equivalent relevance scores.
NOTE #
Elevation is currently a work in progress and not yet available for the general public. Have a look at Elevation WIP for more details.