Execute specified operations task against one or more servers.

		Returns a clc.v2.Requests object.  If error due to server(s) already being in
		the requested state this is not raised as an error at this level.

		>>> clc.v2.Servers(["NY1BTDIPHYP0101","NY1BTDIWEB0101"]).Pause()
		<clc.APIv2.queue.Requests object at 0x105fea7d0>
		>>> _.WaitUntilComplete()
		0

def _Operation(self,operation):
		"""Execute specified operations task against one or more servers.

		Returns a clc.v2.Requests object.  If error due to server(s) already being in
		the requested state this is not raised as an error at this level.

		>>> clc.v2.Servers(["NY1BTDIPHYP0101","NY1BTDIWEB0101"]).Pause()
		<clc.APIv2.queue.Requests object at 0x105fea7d0>
		>>> _.WaitUntilComplete()
		0

		"""

		try:
			return(clc.v2.Requests(clc.v2.API.Call('POST','operations/%s/servers/%s' % (self.alias,operation),
			                                       json.dumps(self.servers_lst),
												   session=self.session),
								   alias=self.alias,session=self.session))
		except clc.APIFailedResponse as e:
			# Most likely a queue add error presented as a 400.  Let Requests parse this
			return(clc.v2.Requests(e.response_json,alias=self.alias,session=self.session))