IT:AD:Lucene.NET:HowTo:Work with Other Languages

If you want to index non-English data, you can write your own analyzer and streamer. However, chances are that someone has already written one that fits the bill and contributed it to Lucene.Net. Currently, the following streamers are supported: Danish, Dutch, Finnish, French, German, Italian, Norwegian, Portuguese, Russian, Spanish, and Swedish. These streamers can be found in the contrib folder of the distribution. If you want to write your own, you can use one of the available analyzers and streamers as a model.

Src: https://www.safaribooksonline.com/library/view/windows-developer-power/0596527543/ch04s04.html