Compute alias from index name when using index template

I have check some discussion on #5359, seems nothing do for it.
I have some index like receipt_2018_v1, receipt_2019_v1, if I change the mapping, the index name will go to receipt_2018_v2, receipt_2019_v2, the alias of these index are read_receipt_2018, read_receipt_2019.
I check the doc, it only support some placeholder, any suggestion on this use case? Or am I missing some other way?

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