private void processField(ImmutableSDField field) {
        if (fieldImplicitlyWordMatch(field)) {
            field.getMatching().setType(MatchType.WORD);
        }
    }
Fields that derive to attribute(s) and no indices should use the WORD indexing form,
in a feeble attempt to match the most peoples expectations as closely as possible.

@author Vegard Havdal
config-model/src/main/java/com/yahoo/schema/processing/AttributesImplicitWord.java