Currently I have a graylog server with Graylog v126.96.36.199 and Elastcisearch v188.8.131.52.
Now I need to upgrade Graylog server to Graylog v2.4.0 and I need to upgrade Elqasticsearch to v 5.6.3 accordingly.
My questing is Once I do the upgrade according to the above mentioned versions, will graylog raise any issue with index on existing indices. I want to keep my old index and indices as it is.
SO I need to know before go to the upgrade, Is above mentioned Graylog and elasticsearch versions are properly working without any issue with old indices.