What does 'nomad system reconcile summaries' do, the docs are lacking

In researching excessive memory use by the nomad servers, I came across ‘nomad system reconcile summaries’, but the docs are lacking as to what it actually does and if it may help in memory reduction on my nomad servers. The docs say…

“Reconciles the summaries of all registered jobs.”

Could I get some more detail on this please?

Cheers
Jonathan