@Override
    public String eventName() {
        return Constants.EVENT_NAME_PLUGIN;
    }
Create a new {@code PluginChangedEvent}.operator is unknown.

@param source   Current plugin state
@param before   Before the change plugin state
@param type     event type
@param operator operator
shenyu-admin/src/main/java/org/apache/shenyu/admin/model/event/plugin/BatchPluginChangedEvent.java