default Stream<? extends Index> indexes() {
        return table()
            .map(Table::indexes)
            .orElse(Stream.empty())
            .filter(HasEnabled::test);
    }
Returns a stream over all enabled indexes in the node tree. Disabled
nodes will be ignored.

@return the enabled indexes
@see Index
@see HasEnabled#isEnabled()
generator-parent/generator-translator/src/main/java/com/speedment/generator/translator/Translator.java