Can I upgrade ELK from 5.0 to 6.4.0 directly

Elastic Stack Elasticsearch
1

Currently we are using ELK 5.0 version. Can I upgrade to 6.4.0 with full cluster restart?
After upgrade all my existing data works without any issues? please suggest.

2

Please see https://www.elastic.co/guide/en/elasticsearch/reference/6.1/setup-upgrade.html

3

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