docs: private HazelcastInstance getOrCreateByInstanceName(String instanceName) {
          HazelcastInstance instance = Hazelcast.getHazelcastInstanceByName(instanceName);
          if (instance == null) {
              Config config = getDefaultConfig();
              config.setInstanceName(instanceName);
              instance = Hazelcast.getOrCreateHazelcastInstance(config);
          }
          return instance;
      }