code: public List<Filter> getAllFiltersForField(String field) {
  		List<Filter> foundFilters = new ArrayList<>();
  
  		for (Filter filter : this.filters) {
  			if (filter.getField().equals(field)) {
  				foundFilters.add(filter);
  			}
  		}
  
  		return Collections.unmodifiableList(foundFilters);
  	}
docs: Returns all filters for a field
  
  @param field name of the field
  @return a collection of filters for the field. Empty collection if no filter exists