Optimistic locking

Hi all and sorry for poor english
I wonder if it's correct to talk about concurrency in elasticsearch .
Exists an optimistic locks for document in elasticsearch?
I found this page , I wonder if it is usefull lock documents as it is shown here:

Elasticsearch doesn't lock documents like a database locks rows.
That article uses a bunch of abstracts to try to offer that.

What are you trying to achieve?

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