Upgrade from ELK 5.4 to 7.6

Elastic Stack Elasticsearch
1

I need to upgrade my system (linux) from ELK 5.4 to 7.6.
I saw several guides about using Upgrade Assistant but it is not exist in Kibana 5.4.
I don't need the old indices and I already delete all indices.
The system consist of 5 hosts. On the master host I have Elasticsearch, Kibana and Logstash. On other 4 hosts I have only Elasticsearch.
What is the right way for doing it?

Thanks in advance

2

Welcome.

You need to upgrade first to the latest 5.x version. Then you will see the upgrade assistant.

3

Thank you!
But if I don't need the current data, is there a problem to just upgrade directly to 7.6?
In addition, I don't have any plugin installed.

4

If you don't need any data, why do you want to upgrade?

Just start from scratch a new cluster.

5

Sounds good to me.
Uninstall version 5.4 and install 7.6?

6

Meantime I already upgrade to 7.6.
Now I get the error with the _state:
ElasticsearchException[java.io.IOException: failed to read /data/disk05/nodes/0/_state/global-447.st]; nested: IOException[failed to read /data/disk05/nodes/0/_state/global-447.st]; nested: IllegalArgumentException[Index patterns must not be null or empty; got null];

Do you think it is better to uninstall and reinstall or maybe somehow to fix this error?

I'm asking since I don't want to delete all config files.

7

Just remove the old data dir before starting.
But this will remove all existing templates

8

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