KA 000097140 has given some information about troubleshooting a slow reindex problem.
3 of 3 people found this helpful
The disable indexer option does not stop additions to the ft_pending table it just stops the indexer from processing them. This allows you to suspend indexing but then be able to re-enable it and have it resume without requiring a full re-index. If you really want to disable FTS altogether you need to remove the FTS license but be aware you will then need to do a full re-index to get FTS up to date again.
5 of 5 people found this helpful
You can also remove the ranking for the server. This stops the entries in ft_pending immediately.
If you later set a ranking again, you have to re-index. Because the index didn't notice any more changes.