Description
In some test runs, flushes seem to leave 2 documents in the ._system._query collection around:
cbo::00000000::_default._default
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cbo::00000000::_default._default(histogram)(meta().id)
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This is causing some tests to fail, sometimes subsequent tests since some tests are not independent:
https://cv.jenkins.couchbase.com/job/backup_integration_tests/job/trinity/53/robot/