@Override
    public String toString() {
        ObjectMapper mapper = ObjectMapperFactory.jsonMapper();
        try {
            return mapper.writeValueAsString(root);
        } catch (JsonProcessingException e) {
            return StringUtils.EMPTY;
        }
    }
Defines {@link ServiceSpec} as tree of JsonNode

@see <a href="https://github.com/hyscale/hspec/blob/master/docs/hyscale-spec-reference.md">Spec Reference</a>
service-spec/service-spec-commons/src/main/java/io/hyscale/servicespec/commons/model/service/ServiceSpec.java