Override auto-detection of language settings
Sharepoint indexing auto-detects the language of a file based on the available content. In case where indexable content is limited (eg DWG files) the results of defining the right language is very poor. To avoid wrong indexing (character sets, number detection) a feature to define override the language to use on file would be preferred.
Thanks for your feedback! Are you using SharePoint Server or SharePoint Online?
Frankie Kou commented
I also occurred this problem but I'm using SharePoint Server. I had some documents which content included Chinese and Portuguese.
Mark Boon commented
Sharepoint Online with Sharepoint Cloud SSA for indexing onpremise content