Our engine is language-agnostic: it supports alphabet-based and symbol-based languages (such as Chinese, Japanese or Korean).
To set the language(s) you want to use for language-specific settings such as ignorePlurals, removeStopWords, and CJK word-detection, you can consult the queryLanguages parameter page.
Please note that you can set an Index's Query Language using the API or using the Dashboard, as detailed in this documentation.