How to reclaim filesystem space in MongoDB on my Openstack Enviroment

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Issue

After setting TTL limits for ceilometer entries, the space is kept by MongoDB in order to be used in future, which might be problematic as the affected database filesystem might be running out of space completely.

Environment

Red Hat OpenStack Platform 9.
Red Hat OpenStack Platform 8.
Red Hat Enterprise Linux OpenStack Platform 7.
Red Hat Enterprise Linux OpenStack Platform 6.

MongoDB with replica set

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