Welcome!
Read elasticsearch logs. They are pretty much explicit.
And then read https://www.elastic.co/guide/en/elasticsearch/reference/current/bootstrap-checks.html
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.