code: public List<OntologyTerm> getChildren(OntologyTerm ontologyTerm) {
      Iterable<org.molgenis.ontology.core.meta.OntologyTerm> ontologyTermEntities =
          () ->
              dataService
                  .query(ONTOLOGY_TERM, org.molgenis.ontology.core.meta.OntologyTerm.class)
                  .eq(ONTOLOGY_TERM_IRI, ontologyTerm.getIRI())
                  .findAll()
                  .iterator();
  
      List<OntologyTerm> children = new ArrayList<>();
      for (Entity ontologyTermEntity : ontologyTermEntities) {
        Entity ontologyEntity = ontologyTermEntity.getEntity(OntologyTermMetadata.ONTOLOGY);
        ontologyTermEntity
            .getEntities(OntologyTermMetadata.ONTOLOGY_TERM_NODE_PATH)
            .forEach(
                ontologyTermNodePathEntity ->
                    children.addAll(
                        getChildOntologyTermsByNodePath(ontologyEntity, ontologyTermNodePathEntity)));
      }
      return children;
    }
docs: Retrieve all descendant ontology terms
  
  @return a list of {@link OntologyTerm}