Today Facet.getValue is the actual field value as string or for range query something mathematical like [0, 200).

This is impractical to expose this in the UI as is (esp the range facet). We could have a facet value interpolator to help.

interface FacetValueInterpolator {

    String interpolateRangeFacetValue(Number min, Number max, boolean includeLowBoundary, boolean includeHighBoundary);
    String interpolateDiscreteFacetValue(String rawValue);
}