law: Registration Act, 1908
  54. Current indexes and entries therein
  In every office in which any of the books hereinbefore mentioned
  
  are kept, there shall be prepared current indexes of the contents of such
  
  books, and every entry in such indexes shall be made, so far as practicable,
  
  immediately after the registering officer has copied, or filed a memorandum of,
  
  the document to which it relates.