@Override
    public Result search(Query query, Execution execution) {
        addRankTerms(query, execution.context().getIndexFacts().newSession(query));
        return execution.search(query);
    }
Adds rank terms to boost hits matching exact literals fields using info
from indexing commands.

@author bratseth
container-search/src/main/java/com/yahoo/prelude/querytransform/LiteralBoostSearcher.java