[source, ruby]
----
response = client.cluster.put_settings(
  body: {
    persistent: {
      'cluster.routing.allocation.disk.watermark.low' => nil,
      'cluster.routing.allocation.disk.watermark.low.max_headroom' => nil,
      'cluster.routing.allocation.disk.watermark.high' => nil,
      'cluster.routing.allocation.disk.watermark.high.max_headroom' => nil,
      'cluster.routing.allocation.disk.watermark.flood_stage' => nil,
      'cluster.routing.allocation.disk.watermark.flood_stage.max_headroom' => nil,
      'cluster.routing.allocation.disk.watermark.flood_stage.frozen' => nil,
      'cluster.routing.allocation.disk.watermark.flood_stage.frozen.max_headroom' => nil
    }
  }
)
puts response
----
