Update README.md

Added warning advice for others to not relete the linux root folder
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juocal 2021-07-27 14:13:12 +02:00 committed by GitHub
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@ -50,6 +50,9 @@ Elasticsearch is enabled by default in the example `docker-compose.yml` file. It
We've updated the Elasticsearch image from 5.6 to 7.6.
As there is no direct upgrade path we have to delete all Elasticsearch indices and rebuild them.
**WARNING:** Check the code below before executing it line by line. When the variable _${DOCKER_VOLUME}_ is not set, the "rm" line may delete your linux root folder!
Do the following to empty the ES docker volume:
```console