Aliasing an alias seems to work, but I don't see it discussed or documented anywhere. In this scenario, the alias that references an index will be updated periodically as it references the hot index in a time series index group. Are there any side effects or restrictions I should know about this "feature"?
It's messy and you could end up with loops. I wouldn't recommend doing it, even if it's possible.
The problem is discussed in detail here: https://github.com/elastic/elasticsearch/issues/3138