public ThrottlePolicy getThrottlePolicy() {
        return throttlePolicy;
    }
Superclass of the classes which contains the parameters for creating or opening a session. This is currently empty,
but keeping this parameter hierarchy in place means that we can later add parameters with default values that all
clients will be able to use with no code changes.

@author bratseth
documentapi/src/main/java/com/yahoo/documentapi/Parameters.java