https://bugzilla.redhat.com/show_bug.cgi?id=1352985
--- Comment #1 from Roland Grunberg rgrunber@redhat.com --- Easy workaround was to delete .taskListIndex/ folder from the mylyn task data storage location. For most users this will probably be in $WORKSAPCE/.metadata/.mylyn/.taskListIndex/ assuming they usd the default location. The index seems to have been re-built and the error no longer occurs.
I'm fine with having this be the workaround, given that lucene may from time to time offer backward compatibility into bundles we don't/can't ship.
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