public Stream<EffectiveMeta> stream() {
        return effectiveMetas.stream();
    }
@return A {@link Stream} of {@link EffectiveMeta} items in ascending order
of {@link EffectiveMeta#getEffectiveMs()}
stroom-meta/stroom-meta-api/src/main/java/stroom/meta/api/EffectiveMetaSet.java