search_core/ext_localconf.php

<?php

call_user_func(function ($extension) {
    // TODO: Add hook for Extbase -> to handle records modified through
    // Frontend and backend modules not using datahandler
    \TYPO3\CMS\Core\Utility\ArrayUtility::mergeRecursiveWithOverrule(
        $GLOBALS['TYPO3_CONF_VARS'],
        [
            'SC_OPTIONS' => [
                'extbase' => [
                    'commandControllers' => [
                        $extension => Codappix\SearchCore\Command\IndexCommandController::class,
                    ],
                ],
                't3lib/class.t3lib_tcemain.php' => [
                    'clearCachePostProc' => [
                        $extension => \Codappix\SearchCore\Hook\DataHandler::class . '->clearCachePostProc',
                    ],
                    'processCmdmapClass' => [
                        $extension => \Codappix\SearchCore\Hook\DataHandler::class,
                    ],
                    'processDatamapClass' => [
                        $extension => \Codappix\SearchCore\Hook\DataHandler::class,
                    ],
                ],
            ],
        ]
    );

    TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
        'Codappix.' . $extension,
        'search',
        ['Search' => 'search'],
        ['Search' => 'search']
    );

    \Codappix\SearchCore\Compatibility\ImplementationRegistrationService::registerImplementations();

    // API does make use of object manager, therefore use GLOBALS
    $extensionConfiguration = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$extension]);
    if ($extensionConfiguration === false
        || !isset($extensionConfiguration['disable.']['elasticsearch'])
        || $extensionConfiguration['disable.']['elasticsearch'] !== '1'
    ) {
        \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Object\Container\Container::class)
            ->registerImplementation(
                \Codappix\SearchCore\Connection\ConnectionInterface::class,
                \Codappix\SearchCore\Connection\Elasticsearch::class
            );
    }
}, $_EXTKEY);