Engineer Training - Lab 6.1 Testing index template returns nothing

Testing index template:
POST _index_template/_simulate_index/my-metrics-test returns nothing
returns nothing, just {} and 200 - OK.
What I missed?

I would check that the index pattern that is used to match the index template works with the name "my-metrics-test". It should be "my-metrics-*" for that particular template.

now, it is ok.
Thank you.