Should be possible to register a list of indexes

[mlesikov]

now we should write it this way

 for (Address address : addresses) {
      searchEngine.register(new AddressIndex(address));
    }

it would be a lot easier if we can just call

  searchEngine.registerAll(addressIndexes);

[mgenov]

cc @stefan-dimitrov @qnislavnachev @VasilMitovClouway as this functionality is required for bulk operations.