Hi @angelogabeira,
I have not done such an upgrade myself, but I found another post from a user who also had to upgrade to version 2.X.
I hope the update process works for you if you first update to version 1.3.5 and then make the switch to version 2.3.
What I can tell you for sure, however, is that OpenSearch Dashboards unfortunately does not like mixed-use clusters. OpenSearch Dashboards didn’t even started with my mixed cluster with a 2.2.0 node and a 2.3.0 node that are only a minor version apart. Maybe this is the Reason why that one node showed up that strange.
In case this didn’t help you we can both try this in our Test Lab so we can share our experiance and work out a Solution. 