No action shall be commenced on account of the issuance of any such bonds after the expiration of twenty days from the date of the filing and indexing of such records as prescribed by §§ 11-15-10 and 11-15-20, and such bonds so issued, when in the hands of a bona fide purchaser for value, shall be incontestable, but the period within which such actions may be commenced shall not begin to run until such records have been filed as herein prescribed.