Yoann, Setting the "tika.config" JVM property programmatically during bootstrapping is the best approach as it only requires minimal changes.

Sanne, regrettably the whole code stack I deal with is stuck on Hibernate Search 5.3... we are planning to migrate our whole code base to the recent versions based on Hibernate 5.3 the next 4-6 weeks, but until then I cannot provide any real useful feedback, sorry