private boolean hasExplicitSignificance(BlockItem blockItem) {
        if (blockItem instanceof TermItem ) return ((TermItem)blockItem).hasExplicitSignificance();
        if (blockItem instanceof PhraseSegmentItem ) return ((PhraseSegmentItem)blockItem).hasExplicitSignificance();
        return false;
    }
Replaces query terms with their stems

@author Mathias Lidal
@author bratseth
@author Steinar Knutsen
container-search/src/main/java/com/yahoo/prelude/querytransform/StemmingSearcher.java