Simulate index API slow


I experience performance issues when calling the simulate index API on 7.17 (via the Java method SimulateIndexTemplateRequest() or /_index_template/_simulate_index/).
Our ES installation runs on a Kubernetes cluster that can handle hundreds of indexings and searches concurrently without issues but a query like:
curl -X POST "http://<HOST>/_index_template/_simulate_index/<MY_INDEX> takes up to 30 seconds to reply.
We have around 20 different index templates. Half of them have around 5 patterns but the other half has around 100 ones. Would this kind of configuration be the reason?

The patterns are all quite similar. Here is a snippet of what we define in the templates


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