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PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.

Elasticsearch

Magento\Elasticsearch module allows to use Elastic search engine for product searching capabilities. The module implements Magento\Search library interfaces.