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Well actually the problem we had with Find not working at all was not related to this error message, but you can get rid of this message by following the tips mentioned in this blog and the referenced doc pages:
http://world.episerver.com/blogs/viktor-sahlstrom/dates/2016/1/improving-search-relevancy-for-attachments/
we have had annoying problems with Find for few weeks now. At some point it seems that UnifiedSearch stops working and we get no results, while some other find searches still work. In error log we see this re-occuring:
The problems seems to go away with IIS reset. Does anyone have any clue what could cause this? Our Episerver DLL:s are in version 9.10.0.0 and Find in 12.0.0.4448