The value from this operation is not persisted in the host xml file, nor is it reflected in a read-resource response:
It also doesn't put the HC in reload-required state.
The /host=slave/core-service=discovery-options/static-discovery=* resources are meant to be a kind of alias for elements in that 'options' list to make it easier to manipulate the details. But that linkage has a bug. (Probably several.)