Hello,
thank you for your answer. I have found a Plugin named Relevanssi, with that I can make a index for my attribute.
The Problem is, that the search is correct when I press Enter after fill some Characters in the search bar, but the AJAX results above shows “no products found”. When I press Enter, I became a right result list.
You know this PlugIn? (Is more than 100000 installations)
Which AJAX Search you implemented, I can ask the Support from Relevanssi?
Thank you!!!!!!!