I am using Elasticsearch Version 5.6.8 . I am changing the elasticsearch path data in elasticsearch.yml to a new folder in a new mountpoint . When i restart the elasticsearch service its giving below error
[2018-06-13T15:49:36,873][ERROR][o.e.b.Bootstrap ] Exception
java.lang.IllegalStateException: detected index data in default.path.data [/var/lib/elasticsearch] where there should not be any; check the logs for details
I have already done chown elasticsearch:elasticsearch for the new folder ..Why is elasticsearch complaining of index data in default.path.data
Is this the old data path, or the new one?
I assume it's the old one.
This error is telling you that you have configured your ES node to use a custom data path, but you also have index data in the default data path (/var/lib/elasticsearch).
This is almost always a mistake, and if ES starts writing to the new data path, then you will get yourself into a state with diverging indices that probably cannot be recovered correctly.
When you create a new (replacement) data path, you need to manually move the data from the old path to the new path. Feel free to keep a copy of the old data somewhere, but don't keep it in the old data path.
The behaviour you are seeing is intentional. It is not a bug, it is attempting to prevent your data from being corrupted due to bugs or misconfiguration.
You can read that message as if it were saying:
You have changed the path.data from its default value to another value, but there is still data in the default location. This could be a misconfiguration, or it could be the result of a bug. Please investigate and make sure that your index data in in the correct place before you restart your node.
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