How to force / finish BackgroundMigrationJob

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Before upgrading my gitlab 13.10.3 installation I checked the prerequisites at https://docs.gitlab.com/ee/update/#installation-using-docker

# gitlab-rails runner -e production 'puts Gitlab::BackgroundMigration.remaining'
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# gitlab-rails runner -e production 'puts Gitlab::Database::BackgroundMigrationJob.pending.count'
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How can I force BackgroundMigrationJob.pending to finish? Or is it safe for me to upgrade?