code: def FailoverInstance(r, instance, iallocator=None, ignore_consistency=False,
                       target_node=None):
      
  
      body = {
          "ignore_consistency": ignore_consistency,
      }
  
      if iallocator is not None:
          body["iallocator"] = iallocator
      if target_node is not None:
          body["target_node"] = target_node
  
  
      return r.request("put", "/2/instances/%s/failover" % instance,
                       content=body)
docs: Does a failover of an instance.
  
      @type instance: string
      @param instance: Instance name
      @type iallocator: string
      @param iallocator: Iallocator for deciding the target node for
          shared-storage instances
      @type ignore_consistency: bool
      @param ignore_consistency: Whether to ignore disk consistency
      @type target_node: string
      @param target_node: Target node for shared-storage instances
      @rtype: string
      @return: job id