ehcache.xml is the configuration file for Ehcache.
Ehcache used to be the default second level cache of Hibernate but since Hibernate 3.2+ it's no longer the default (which is now no second level cache), and needs to be explicitely defined in hibernate.cfg.xml to be used (which we're not doing).
In addition we shouldn't have a second level cache set up since this would cause issues when our clustering is enabled.
We can thus safely remove ehache.xml since:
- the ehache.xml file is not used
- we don't need such a cache (since we do our own document level caching)
- it can cause issue in cluster mode