Lost configuration / data on my fess instance

(from github.com/attibalazs)
Hi, i lost all the configurations and data i had indexed on my fess instance.
Not sure what happened is there a way to debug this ? Happened on version 10.2, has this happened to you, is this a bug?

(from github.com/marevol)
See log files in logs directory.
Configuration data is in data/ directory.
If you change cluster name for elasticsearch, you need to change data directory.

(from github.com/attibalazs)
that might have been the cause i did change the cluster name. Thanks a lot for the quick answer.

(from github.com/ghost)
What is the location of the data directory?

(from github.com/marevol)
The location is es/data or /var/lib/elasticsearch.