WP_REST_Post_Search_Handler::prepare_item

	public function prepare_item( $id, array $fields ) {
		$post = get_post( $id );

		$data = array();

		if ( in_array( WP_REST_Search_Controller::PROP_ID, $fields, true ) ) {
			$data[ WP_REST_Search_Controller::PROP_ID ] = (int) $post->ID;
		}

		if ( in_array( WP_REST_Search_Controller::PROP_TITLE, $fields, true ) ) {
			if ( post_type_supports( $post->post_type, 'title' ) ) {
				add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
				$data[ WP_REST_Search_Controller::PROP_TITLE ] = get_the_title( $post->ID );
				remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
			} else {
				$data[ WP_REST_Search_Controller::PROP_TITLE ] = '';
			}
		}

		if ( in_array( WP_REST_Search_Controller::PROP_URL, $fields, true ) ) {
			$data[ WP_REST_Search_Controller::PROP_URL ] = get_permalink( $post->ID );
		}

		if ( in_array( WP_REST_Search_Controller::PROP_TYPE, $fields, true ) ) {
			$data[ WP_REST_Search_Controller::PROP_TYPE ] = $this->type;
		}

		if ( in_array( WP_REST_Search_Controller::PROP_SUBTYPE, $fields, true ) ) {
			$data[ WP_REST_Search_Controller::PROP_SUBTYPE ] = $post->post_type;
		}

		return $data;
	}