Hi @cafissimo,
Configuration across a pool of indexers in a cluster should be homogenous for easier maintenance, better performance and simplicity. It is however "technically" possible to install an app on one of the indexers if you do the install manually on that specific indexer, it would then be possible to do an automated failover (via script) or manual failover if needed.
Depending on the use case some costumers when confronted with such a scenario would rather go for the option where the input is enabled on all indexers which means less of a headache for managing it but more license cost if the volume is too high.
I would say the right answer to your question is "no" you shouldn't have the cluster peers running different apps. But business requirements take precedence sometimes over best practice and therefore you can do it when you see that there is no possibility (which is rarely the case) to have the input running on all ur indexers or even on a set of heavy forwarders.
Cheers,
David
