private void processFieldRecursive(ImmutableSDField field) {
        processField(field);
        for (ImmutableSDField structField : field.getStructFields()) {
            processFieldRecursive(structField);
        }
    }
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