Please format your code, logs or configuration files using </> icon as explained in this guide and not the citation button. It will make your post more readable.
Or use markdown style like:
```
CODE
```
This is the icon to use if you are not using markdown format:
There's a live preview panel for exactly this reasons.
Some thoughts:
- You should not be connected as root but as
elasticsearchuser. - The documentation says to run:
sudo bin/elasticsearch-plugin install ingest-user-agent
May be you did not follow from the start how to properly install elasticsearch? Which package did you install?