Consider close match to facet selection in ranking

[twagoo]

From a response in the feedback document "Unexpected behaviour of the VLO":

As an example, can we conclude that some records that have language:German are more German in terms of language than others in the same result set? Perhaps only in that some of these may only have German. Another example that might work is the keyword facet, where record with the selected keyword(s) appearing in the title could get a boost – perhaps this could be generalized to all facet selection but we have to test this to see how well it works in practice.

Investigate, and implement as a boost if feasible, probably by injecting some parameter into the search query to the index.

Note that this may not be applicable to all fields!