47684.php

<?php

// Filter search endpoint responses.
add_filter( 'rest_post_dispatch', 'wp_47684_filter_response', 10, 3 );

/**
 * Resolves the behavior reported in WP Core Trac 47684.
 *
 * @see https://core.trac.wordpress.org/ticket/47684
 *
 * @param WP_REST_Response $response The REST API response object.
 * @param WP_REST_Server   $server   The REST API server instance handling the request.
 * @param WP_REST_Request  $request  The REST API request object.
 *
 * @return WP_REST_Response
 */
function wp_47684_filter_response( WP_REST_Response $response, WP_REST_Server $server, WP_REST_Request $request ) : WP_REST_Response {
	if ( '/wp/v2/search' !== $request->get_route() ) {
		return $response;
	}

	foreach ( $response->data as $index => $result ) {
		// Duplicate the `self` link as `original` to allow embedding.
		if ( isset( $result['_links']['self'] ) ) {
			$response->data[ $index ]['_links']['original'] = $result['_links']['self'];
		}

		// Make the `self` link non-embeddable.
		if ( isset( $result['_links']['self'][0]['embeddable'] ) ) {
			unset( $response->data[ $index ]['_links']['self'][0]['embeddable'] );
		}
	}

	return $response;
}