What are all the drawbacks of running a single node elastic cluster?

To run elasticsearch on a single node that acts as ingest, master and data node.
A major advantage is the lower resource consumption.
A drawback is that data will not be replicated. How dangerous is that?
Another is that if it goes down, the elasticsearch service does as well, until it is brought back up (I think that is something I can live with in my case).
What are all the drawbacks though?

Welcome! :slight_smile:

How important is the data.

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