You can find that issues mentioned on github.
There's a couple of notes on elasticsearch:
1. In the 6.x branch of ES there is a weird limitation for some fieldtypes, that why dome products cannot be indexed. I opened issue on github about that, but still no answer.
2. It is obviuos, that native TB's (or Prestashop's) search engine can fulfil 90% of customer needs (if not 99) and ES required for shops with huge SKU amounts, that's why there's no much progress in this module development.
You can find that issues mentioned on github.
There's a couple of notes on elasticsearch:
1. In the 6.x branch of ES there'a a weird limitation about some fieldtypes, that why some products cannot be indexed. I opened issue on github about that, but still no answer.
2. It is obviuos, that native TB's (or Prestashop's) search engine can fulfil 90% of customer needs (if not 99) while ES required mostly for shops with huge SKU amounts, that's why there's no much progress in this module development.