You can delete a language that you added as a preferred language for search. When you delete the language, business users can't search for the records in that language.
1Click Localization > Searchable Languages.
2Hover over the language that you want to delete, and click Delete.
3Click Save.
After you delete the language, business users can't view Japanese - JA as the search language in business applications.
After you delete the language, ensure that you run the generate search indexes and match keys job to reindex the business entity records.