docs: @Operation(name="$closure")
     public ConceptMap closureOperation(
        @OperationParam(name="name") StringDt theStart,
        @OperationParam(name="concept") List<CodingDt> theEnd,
        @OperationParam(name="version") IdDt theVersion) {
        
        ConceptMap retVal = new ConceptMap();
        // Populate bundle with matching resources
        return retVal;
     }