public void addFieldRankWeight(String field, int weight) {
        verifyThat(! fieldsRankType.containsKey(field), "already has weight for field", field);
        fieldsRankWeight.put(field, weight);
    }
This class holds the extracted information after parsing a
rank-profile block in a schema (.sd) file, using simple data
structures as far as possible.  Do not put advanced logic here!

@author arnej27959
config-model/src/main/java/com/yahoo/schema/parser/ParsedRankProfile.java