Reindex: how Elastic handle index names

Hello,
I read sometime that some operation are impossible on current index and so the strategy is to create a new one an the reindex there all the data stored.
I'm a newbie here and this could be a stupid question but my doubt is related to how elastic handle indexes generated by a template.
To be more pragmatic:
I have some inexes:

my_index-0001
my_index-0002
my_index-0003 (current)

Now I have to create a new index to reindex the my_index-0002.
Can I create a my_index-0004 and them operate on it? What happen when elastic need to close the 0003? There could be problem because the next number is already used (manually generated by me)?
What is the strategy in this case?

Thanks

Perhaps name your reindexed the index something like

my_index-reindex

Or

my_index-0002-reindex

Or

my_index-0002R

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