Can you set pooling for a hosted feature service (portal)?

[TL2]

Can you set pooling for a hosted feature service on a datastore for portal 10.4.1?

Now, I know that you literally can go into service properties for that HFS and change the pooling but it seems to break the hosted feature service.

Is this something that, while can be done, should not be done?

[JayantaPoddar]

All services published with ArcGIS 10.1 for Server and later releases, are pooled. This means that instances of the service can be shared between multiple application sessions.

Tuning and configuring services—Documentation | ArcGIS Enterprise 

[TL2]

I did see that.  When I change the instances though it seems to break it.  The following scenario, with changes made in red, seem to break the HFS.  But the ability to change them is available.

[JamesGustine]

I think what the OP means to ask is.. can you set the Min # of instances to 0? . We have a similar situation with many Hosted feature services published for Survey123. In general these services just sit there, so what's the point in having a instance spun up and waiting? I've done some testing and while portal and web apps are cool with it, it seems that Survey 123 isn't.

[JonathanQuinn]

Instances are only applicable to non-hosted services, or your traditional map/feature services, as a SOC process is created for these services.  Hosted services are considered "light weight" as they don't spin up a SOC process so the concept of instances is not relevant to hosted services.