@Override
    public String toString() {
        return "a resolution of " + choiceResolutions.size() + " choices";
    }
Returns the resolution of a map choice.

@return the chosen mapping - entries from placeholder id to the values to use at the location of that placeholder
@throws IllegalArgumentException if this choice has not been resolved in this
container-search/src/main/java/com/yahoo/search/pagetemplates/engine/Resolution.java