# File lib/thinking_sphinx/active_record.rb, line 254
      def delete_in_index(index, document_id)
        return unless ThinkingSphinx.sphinx_running? &&
          search_for_id(document_id, index)
        
        ThinkingSphinx::Configuration.instance.client.update(
          index, ['sphinx_deleted'], {document_id => [1]}
        )
      rescue Riddle::ConnectionError, ThinkingSphinx::SphinxError
        # Not the end of the world if Sphinx isn't running.
      end