Hello,
I had same issue with Chines(zh),Japines(ja),Korean(ki) languages, As you know these are differs from other languages representation.
For time being I have fixed this by targeting the languages and changing the querybuilder API parameters as below.
parms.put("property", "key");
parms.put("property.value","%"+value+"%");
parms.put("property.operation", "like");
You can try out this for time being if it fulfills your requirements.