About the use of metadata in elastic search

I would like to ask how the metadata data structure in Elasticsearch is used when executing various apis. Will a copy of the metadata be saved at the beginning of each call to the api? Or can you provide an entry to the api? I can't find the entry point for the api call by myself.

Because when the api is called, the metadata should always remain unchanged, which involves the problem of atomicity. So I want to know if the metadata will save a backup at the beginning of the api call.

It's not clear what metadata you are referring to here.

sorry for that, I mean aliasmetadata

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