How to improve reindexing Magento 2.3.3 [EE]?
It takes around 20min to reindex full.
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Change all indexer mode to 'Update by Schedule'
Changing the batch size can help you optimize indexer running time. https://devdocs.magento.com/guides/v2.4/extension-dev-guide/indexer-batch.html
If customer indexer is there, make sure the logic is optimized.