@Override
    protected void derive(ImmutableSDField field, Schema schema) {
        if (field.usesStructOrMap()) {
            return; // unsupported
        }
        deriveIndexFields(field, schema);
    }
Deriver of indexschema config containing information of all text index fields with name and data type.

@author geirst
config-model/src/main/java/com/yahoo/schema/derived/IndexSchema.java