https://docs.mongodb.com/manual/reference/text-search-languages/

The page says that we can enable chinese language support by getting a RLP license but when I follow the instruction to get the license, the people at  info@basistech.com replied back: 

Unfortunately, per a management decision, we are no longer licensing the RLP C++ platform to new customers. This is an older technology that we have decided as an organization to sunset.

So is there any other way to solve this?