replaceCollections example

'latestVersion' => $plugin->getUpgradeVersion(),
            'iconRaw' => $plugin->getIcon(),
            'installedAt' => $plugin->getInstalledAt(),
            'active' => $plugin->getActive(),
            'type' => ExtensionStruct::EXTENSION_TYPE_PLUGIN,
            'isTheme' => $isTheme,
            'configurable' => $this->configurationService->checkConfiguration(sprintf('%s.config', $plugin->getName()), $context),
            'updatedAt' => $plugin->getUpgradedAt(),
            'allowDisable' => true,
        ];

        return ExtensionStruct::fromArray($this->replaceCollections($data));
    }

    /** * @return array<string> */
    private function getInstalledThemeNames(Context $context): array
    {
        if ($this->installedThemeNames === null && $this->themeRepository instanceof EntityRepository) {
            $themeNameAggregationName = 'theme_names';
            $criteria = new Criteria();
            $criteria->addAggregation(new TermsAggregation($themeNameAggregationName, 'technicalName'));