By default search terms will be analyzed based on the the site's primary language setting as defined on the general settings page in the admin.
Altis includes analyzers for the following languages:
Note: Altis Support cannot provide assistance with tuning relevancy scores, or language analysis in languages other than English. Altis Partners may be able to provide consultation for these languages; contact your account manager for more information.
The Search module includes the Japanese language analyzer (kuromoji), as well as the custom user dictionary tools designed specifically for Japanese support.