Since the beginning of the week (approximately) we're having transient failures in IndexingActionInterceptorTest. The logs contain the following error:
See for instance http://ci.hibernate.org/job/hibernate-search-master/988/
I suspect it's a pre-existing bug, but we only see it now because of https://github.com/hibernate/hibernate-search/pull/1432, which had the effect of not executing subsequent works in a changeset when one work fails (while previously we considered each work independent from the others). (Note that this was still the right choice, since it aligned the behavior on embedded Lucene).
We should investigate why the delete by query fails in the first place.