HashSet filtering can not be set for DeduplicateRecord processor

The following calculation determines which filtering method should be used:

boolean useHashSet = context.getProperty(FILTER_TYPE).getValue()
.equals(context.getProperty(HASH_SET_VALUE.getValue()).getValue());

As HASH_SET_VALUE is an Allowable value not a PropertyDescriptor, this boolean will always be false, so in all cases Bloom Filter will be used.