AUTO_LEXER
Identifies the language being indexed by examining the content, and applies suitable options (including stemming) for that language. Works best where each document contains a single-language, and has at least a couple of paragraphs of text to aid identification.
Use the AUTO_LEXER type to index columns that contain documents of different languages. It performs language identification, word segmentation, document analysis, and stemming. The AUTO_LEXER also enables customization of these components. Although parts-of-speech information that is generated by the AUTO_LEXER is not exposed for your use, AUTO_LEXER uses it for context-sensitive or tagged stemming.