Specifics for Disabling Allocation Awareness Dynamically

This page https://www.elastic.co/guide/en/elasticsearch/reference/1.5/modules-cluster.html says that allocation awareness "settings can be updated using the cluster update settings API on a live cluster."

If I have settings like these from that page:

cluster.routing.allocation.awareness.force.zone.values: zone1,zone2
cluster.routing.allocation.awareness.attributes: zone

Do I put empty strings to those keys when I update the cluster settings?

Thanks