Filter on eventType property with LHS bracket notation.

Expected value format is a string (bulk.operation.created, bulk.operation.ended, classroom.slot.attendance.sheet.signed, course.attempt.closed, courses.skills.added, courses.skills.removed, group.created, group.deleted, group.updated, groups.catalog.courses.added, groups.catalog.path.sessions.added, groups.library.courses.added, groups.library.courses.removed, groups.library.paths.added, groups.library.paths.removed, path.archived, path.created, path.deleted, path.session.added, path.session.removed, path.session.classroom.slot.created, path.session.classroom.slot.deleted, path.session.classroom.slot.updated, path.session.classroom.slot.users.unregistered.full, path.session.classroom.slot.waitlist.closed, path.session.classroom.slot.waitlist.opened, path.session.classroom.slot.waitlist.user.joined, path.session.user.status.updated, path.session.users.enrolled, path.session.users.unenrolled, paths.skills.added, paths.skills.removed, path.updated, skill.created, skill.deleted, skill.updated, user.activated, user.assessment.corrected, user.certificate.awarded, user.classroom.slot.registered, user.classroom.slot.rsvp.going.yes, user.classroom.slot.rsvp.going.no, user.classroom.slot.unregistered, user.created, user.customfield.created, user.customfield.deleted, user.customfield.updated, user.customfield.values.updated, user.deleted, user.invited, user.reactivated, user.updated, xapi.started, xapi).