ABOUT THIS FORK

This fork is removing all dependencies for elasticsearch and opensearch.
It removes elasticsearch, elasticsearch7 and opensearch modules from the codebase.
As a replacement the module swissup/module-search-mysql-legacy is added, which contains an adapted version of the latest mysql search implementation from Magento 2.3.7.

In addition to that, all references and usages of elasticsearch are removed in this fork.

Main Changes

• include swissup/module-search-mysql-legacy
• remove modules
  • magento/module-elasticsearch
  • magento/module-elasticsearch7
  • magento/module-opensearch
  • elasticsearch/elasticsearch from root composer.json
• cleanup SearchConfigOptionsList so options are removed from CLI setup:install
• dev/tests modifications

Tests

The fork has been tested with the mage-os / sample-data, both during install and setup:upgrade.

There is one Test that has a hard requirement for an elasticsearch class: app/code/Magento/CatalogSearch/Test/Unit/Model/Indexer/FulltextTest.php

There is other places where elasticsearch is used for naming:

• Mftf Tests (are being used?)
• Integration Tests
• api-functional
• phpcpd

References to elasticsearch which are deemed relevant have not (yet) been removed.

Notes

Test dev/tests/integration/testsuite/Magento/Catalog/Model/Layer/Filter/Price/AlgorithmBaseTest.php has some references to elasticsearch but seems to also have other missing dependencies.

setup/src/Magento/Setup/Model/SearchConfigOptionsList.php should be made configurable to get available search-engines, using di.xml fromn the modules that are installed.
Module magento/module-elasticsearch should contain the options to select elasticsearch during install process.
For now the options in \Magento\Setup\Model\SearchConfigOptionsList::getAvailableSearchEngineList have been disabled.

\Magento\Setup\Model\SearchConfigOptionsList::getOptionsList also needs to be made extensible by di.

NEXT STEPS

• Execute Test Suites and see if affected Tests work
• Make SearchConfigOptionsList configurable through di
• Configure SearchConfigOptionsList for elasticsearch 7/8 and opensearch modules

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