code: public final FacetOptions addFacetByRange(FieldWithRangeParameters<?, ?, ?> field) {
  		Assert.notNull(field, "Cannot range facet on null field.");
  		Assert.hasText(field.getName(), "Cannot range facet on field with null/empty fieldname.");
  
  		this.facetRangeOnFields.add(field);
  		return this;
  	}
docs: Append additional field for range faceting
  
  @param field the {@link Field} to be appended to range faceting fields
  @return this
  @since 1.5