Is sequence-numbers support merged in?

Elastic Stack Elasticsearch
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Hello,
there's Github issue about adding – can anyone correct me if I'm wrong – automatically generated numbers that do what in MySQL is done with column "id integer primary key autoincrement". Is that true, this support is merged and available?

I want to store log messages to elasticsearch. Such logs are ordered, so I think I need the "autoincrement"-like number. Is my approach correct, or should I use different technique to handle logs?

How to use _seq_no? I cannot catch a consistent view on it, and isn't sure if Github ticket is for the same thing.

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Sequence numbers are at the operation level (not document level) in Elasticsearch and does not at all behave like automatically generated numbers/ids in relational databases. They are instead used to order and keep track of operations so replication and recovery can be made more efficient.

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