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.

Change the Elasticsearch Client

As of version 2.3.7, Adobe Commerce supports Elasticsearch 7.9.3 but should work with 7.x. Support for Elasticsearch 6.x has been deprecated. Elasticsearch 2.x and 5.x have reached end-of-life and are no longer supported.

Change the Elasticsearch Client version

If you need to work with Elasticsearch 7.x, run the following command, specifying your desired version:

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composer require "elasticsearch/elasticsearch:~7.1"

Then configure Elasticsearch within Admin.