public function initIndexEngineIndexVersions($overrideExisting = true)
    {
        if (null !== $this->collIndexEngineIndexVersions && !$overrideExisting) {
            return;
        }
        $this->collIndexEngineIndexVersions = new ObjectCollection();
        $this->collIndexEngineIndexVersions->setModel('\IndexEngine\Model\IndexEngineIndexVersion');
    }