There is a section in the Magento 2.3 documentation that is titled EAV indexer optimization. It says that you should basically disable the EAV indexer, if you are not using a MySQL based search function.
In our case we use FACT-Finder, so this would be relevant to us. However, in our Magento 2.3.2 instance, there is no Stores > Settings > Configuration > Catalog > Catalog > Catalog Search settings section and I cannot find the mentioned options anywhere else.
Also I am wondering: even if you do not use a MySQL search: shouldn’t the EAV flat tables still be faster for product listings etc.?