Delete the backend server; delete a group of backend servers from the Server Load Balancer instance to return the backend server list in the Server Load Balancer instance.
Note: If some backend servers in BackendServers do not exist in the Server Load Balancer instance, they will be ignored directly without any error being reported.
Mandatory or not
Name of the operating interface, which is specified in the system Value：RemoveBackendServers
The unique ID of an Server Load Balancer instance
Backend server list to be removed. Value：It is a Jsonstring, and its structure is a JsonList. The elements in the List are in String type, which are ServerIds of the backend Server. The List can only contain 20 elements at most in one request.