Clarifications regarding aliases?

Elastic Stack Elasticsearch
1

When i went through aliases documentation https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html . i had one doubt

It is an error to index to an alias which points to more than one index.

What does the above sentence mean?

2

When an alias points to several indexes, what behaviour would you expect? Should every index be updated? Or just one?
Perhaps the phrasing should be changed: "Trying to index into an alias that points to more than one index is not supported and will result in an error"

3

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