Add WooCommerce Orders as a SearchWP Source.

searchwp-customizations.php

<?php

// Add WooCommerce Orders as a SearchWP Source.
// @link https://searchwp.com/documentation/knowledge-base/search-woocommerce-orders/
add_action( 'plugins_loaded', function() {
	add_filter( 'searchwp\sources', function( $sources ) {
		$sources[] = new \SearchWP\Sources\Post( 'shop_order' );

		return $sources;
	} );

	add_filter( 'searchwp\post_stati\shop_order', function( $post_stati ) {
		return array_merge( $post_stati, [
			'wc-pending',
			'wc-processing',
			'wc-on-hold',
			'wc-completed',
			'wc-cancelled',
			'wc-refunded',
			'wc-failed',
		] );
	} );
} );