public Object getProperty(String name) {
            return accept(new PropertyValueVisitor(name)).foundValue();
        }
Returns a property set anywhere in the trace tree this points to.
Note that even though this call is itself "thread robust", the object values returned
may in some scenarios not be written behind a synchronization barrier, so when accessing
objects which are not inherently thread safe, synchronization should be considered.
<p>
This method have a time complexity which is proportional to
the number of trace nodes in the tree

@return the value of this property, or null if none
container-core/src/main/java/com/yahoo/processing/execution/Execution.java