Update search module to use the configuration system.
function search_update_8000() {
update_variables_to_config('search.settings', array(
'minimum_word_size' => 'index.minimum_word_size',
'overlap_cjk' => 'index.overlap_cjk',
'search_cron_limit' => 'index.cron_limit',
'search_tag_weights' => 'index.tag_weights',
'search_active_modules' => 'active_modules',
'search_and_or_limit' => 'and_or_limit',
'search_default_module' => 'default_module',
));
}