3053.php

<?php

function my_searchwp_omit_meta_key( $omit, $meta_key, $the_post ) {
	$url_meta = 'link-url';
	$url_found = strpos( $meta_key, $url_meta );

	// if "link-url" is in a custom field meta key name, do not index it
	if ( false !== $url_found ) {
		$omit = true;
	}

	return $omit;
}

add_filter( 'searchwp_omit_meta_key', 'my_searchwp_omit_meta_key', 10, 3 );