$indexes=$GLOBALS['FORUM_DB']->query('SHOW INDEXES FROM '.$GLOBALS['FORUM_DB']->get_table_prefix().'f_member_custom_fields WHERE Column_name<>\'mf_member_id\'');
foreach($indexesas$index){
$GLOBALS['FORUM_DB']->query('DROP INDEX '.$index['Key_name'].' ON '.$GLOBALS['FORUM_DB']->get_table_prefix().'f_member_custom_fields');