code: @SuppressWarnings("unchecked")
  	@Override
  	public Collection<String> getCopyFields() {
  
  		Indexed indexedAnnotation = getIndexAnnotation();
  		if (indexedAnnotation != null && indexedAnnotation.copyTo().length > 0) {
  			return CollectionUtils.arrayToList(indexedAnnotation.copyTo());
  		}
  		return Collections.emptyList();
  	}
docs: /*
  (non-Javadoc)
  @see org.springframework.data.solr.core.mapping.SolrPersistentProperty#getCopyFields()