We are using the intsights app for splunk cloud as the intsights app installed on splunk idm,we notice that when we try to create a inputs to get the alerts,we are not able to select the custom index created in the indexer.
Why the all indexes which are present in splunk cloud not populating in the intsights app splunk idm ??
indexes created on on-premise Indexers aren't visible on on premise Search Heads, but on Splunk Cloud you should be able to see all Indexes.
Check the grants of the user you're using.
I suppose that this app is installed in Splunk Cloud, or not?
if on-premise, it's a different thing: it's normal that you don't see it, it's the same thing if you have an Indexer an a Search Head.
In this case you have two solutions: configure the index in the input.conf file, create an empry index with the same name on the on-premise Search Head.