<?php // Customize a SearchWP Entry before it is indexed. add_filter( 'searchwp\entry\data', function( $data, $entry ) { // Use this key when adding a Custom Field Attribute. $extra_meta_key = 'my_extra_meta'; $value = 'This is extra data to index as extra meta'; // SearchWP's Post Meta Attribute expects that data is made of Tokens. $data['meta'][ $extra_meta_key ] = new \SearchWP\Tokens( $value ); return $data; }, 20, 2 );