Yes, but you can copy from multiple indices into one. eg winlogbeat-windows-winsecurity-2021.01.* > winlogbeat-windows-winsecurity-2021.01.
More efficient resource use.
Ideally, you should switch to ILM.
Oh, my mistake about being able to copy from multiple indexes 
Also wouldnt consume that much time....
I currently use ILM to delete my indexes after 180 days BUT I believe I only use it for that....
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