Solr Power Custom Field Filter Example

gistfile1.txt

<?php
function filter_solr_index_custom_fields( $facet_on_custom_fields ) {
	$car_custom_fields = array(
		'vehicle_cylinders',
		'vehicle_drive_type',
		'vehicle_fuel_type',
		'vehicle_transmission',
		'vehicle_year',
	);

	return array_merge( $facet_on_custom_fields, $car_custom_fields );
}
add_filter( 'solr_index_custom_fields', 'filter_solr_index_custom_fields', 10, 1 );