I pulled the ICUTransformFilter out of
LUCENE-1488 and create an issue for it here.
This is a tokenfilter that applies an ICU Transliterator, which is a context-sensitive way
to transform text.
These are typically rule-based and you can use ones included with ICU (such as Traditional-Simplified)
or you can make your own from your own set of rules.
User's Guide: http://userguide.icu-project.org/transforms/general
Rule Tutorial: http://userguide.icu-project.org/transforms/general/rules