Problem with full-text index immediate update

Hi! I want to use a notes database as data storage for a web application, using REST (Domino Data Services) for reading and writing documents; I need to use the full-text index for finding documents. My Problem is, I need the full-text index to refresh instantaneous, but after creating or deleting a document via REST the full-text index is not updated for the next 15 to 20 minutes, even though the update frequency of the database is set to “immediate”. This also happens when I create or delete a document using the notes client; the problem can be reproduced with every database i created on this server.
I use a Domino 9.0 Server HF328 64-bit on a Windows Server 2012 R2 64-bit. The relevant Variables in the notes.ini are:

Do you have any ideas to let the full-text index update instantaneous?

Greets,
Martin

Subject: In case someone’s looking, I ran into this link.

https://www.ibm.com/support/knowledgecenter/en/SSKTMJ_8.0.1/com.ibm.help.domino.admin.doc/DOC/H_INDEXER_TASKS_UPDATE_AND_UPDALL_STEPS.html https://www.ibm.com/support/knowledgecenter/en/SSKTMJ_8.0.1/com.ibm.help.domino.admin.doc/DOC/H_INDEXER_TASKS_UPDATE_AND_UPDALL_STEPS.html

It has some useful Notes.INI settings for doing this: UPDATE_IDLE_TIME and FTUPDATE_IDLE_TIME if you use UPDATE_FULLTEXT_THREAD=1. Looks like they’re both in seconds.