Cal. Gov. Code § 27327

Any instrument filed for record in the office of the county recorder of the county where it is entitled to record and which is copied into a book of record other than that designated by law, but which is thereafter indexed in the proper book of indices, imparts notice of its contents to all persons from the date of such indexing, and any subsequent purchaser, mortgagee, lien-holder, and encumbrancer purchases and takes with the same notice and effect as if the instrument were copied or recorded in the proper book of record.