public Annotations getAnnotation(AnnotationClass clazz) {
        return getAnnotation(from, to, clazz);
    }
Returns the annotations with a specific class for the area defined by this span
<p>

This function will query its parent to find any annotation that is set for an area that this span is contained
in. If there are conflicts (several annotations defined with the same annotation class), the annotation
that is defined for the smallest area (furthest down in the tree), is used.
container-search/src/main/java/com/yahoo/text/interpretation/Span.java