lucene index directory lock by multiple embedded cache

While creating Infinispan Cache, i noticed Apache Lucene was used. But i can't find any place to configure where Lucene Directories/Files should be created.

My infinispan jars is embedded throughout 6 different tomcat on the same physical server, and the consequence is i have only one lucene directory shared for my multiple tomcats. (directory created in ~)

How could we configure lucene directory path ?