How to upgrade a single node elasticserch cluster with out data loss
Welcome to our community! 
What version are you on?
7.10.1
How did you initially install Elasticsearch... rpm / Deb etc?
There is documentation below an if you shut down Elasticsearch gracefully you should be OK.
Of course we would recommend taking a snapshot first just to be careful.
Snapshot and restore | Elasticsearch Guide [7.16] | Elastic.
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