private Stemming getEffectiveStemming(ImmutableSDField field) {
        Stemming active = field.getStemming(schema);
        if (field.getIndex(field.getName()) != null) {
            if (field.getIndex(field.getName()).getStemming()!=null) {
                active = field.getIndex(field.getName()).getStemming();
            }
        }
        return Objects.requireNonNullElse(active, Stemming.BEST);
    }
Returns whether a particular command is prsent in this index info
config-model/src/main/java/com/yahoo/schema/derived/IndexInfo.java