def reindex(facts_to_index, fixtures)
      @index_data = {}
      facts_to_index.each { |fact| add(fact, fixtures) }
      set_top_level_nodes_fact(fixtures)
    end
def reindex(facts_to_index, fixtures)
      @index_data = {}
      facts_to_index.each { |fact| add(fact, fixtures) }
      set_top_level_nodes_fact(fixtures)
    end
Rebuild an index with a specified list of facts. This will remove any indexed facts that
 are not on the list of facts to use.

 facts_to_index - An Array of Strings with facts to index
 fixtures       - An Array with fact fixtures (must respond to .facts and .hostname)