Our Algolia ranking rules keep getting resetting and after some reseraching/testing it looks like the reindex might be causing it to reset.
After reindex settings look like
we are using magento cloud 2.2.5 with Algolia 1.7.2
is it a known bug?
Did you try to add the index configuration in the Magento back-office (In Stores > Configuration > Algolia Search > Advanced - Extra Algolia indices settings ) ?
Here is the documentation : https://www.algolia.com/doc/api-reference/settings-api-parameters/#index-settings-parameters
Hope this would help.