You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: indexes.rb
    path of file: ./repos/picky/server/lib/picky
    
    the code of the file until where you have to start completion: module Picky

  # Holds all indexes and provides operations
  # for 
    
    def register index
      # TODO Do not store duplicate indexes.
      #
      # self.indexes.delete_if { |existing| existing.name == index.name }
      self.indexes << index
      self.index_mapping[index.name] = index
    end