docs: public ClassInfoList getClassesWithFieldAnnotation(final String fieldAnnotationName) {
          if (closed.get()) {
              throw new IllegalArgumentException("Cannot use a ScanResult after it has been closed");
          }
          if (!scanSpec.enableClassInfo || !scanSpec.enableFieldInfo || !scanSpec.enableAnnotationInfo) {
              throw new IllegalArgumentException("Please call ClassGraph#enableClassInfo(), #enableFieldInfo(), "
                      + "and #enableAnnotationInfo() before #scan()");
          }
          final ClassInfo classInfo = classNameToClassInfo.get(fieldAnnotationName);
          return classInfo == null ? ClassInfoList.EMPTY_LIST : classInfo.getClassesWithFieldAnnotation();
      }