Upgraded hibernate-core to 5.2.0.Final, do break hibernate-search integration.

Caused by: java.lang.NoSuchFieldError: session
at org.hibernate.search.impl.FullTextSessionImpl.getSearchIntegrator(FullTextSessionImpl.java:202)
at org.hibernate.search.impl.FullTextSessionImpl.getSearchFactory(FullTextSessionImpl.java:195)
at org.hibernate.search.jpa.impl.FullTextEntityManagerImpl.getSearchFactory(FullTextEntityManagerImpl.java:113)

Worked well with hibernate 5.1.0.Final.