I was pretty excited to have a look at the Open Source version of Elasticsearch.
I can understand the reasons for the fork. However, I do not believe that Opensearch will ever become more than a toy.
Without a good project coordinator and somebody with a good vision for how the project needs to evolve it won't work - freedom sometimes means nothing left to loose … But it was fun to compare it to Elastic and make it work

Opensearch Installation on Linux (Debian or Ubuntu)

Dashboards Installation on Linux (Debian or Ubuntu)

Run Kibana on standard ports (80 or 443) to access Opensearch Dashboards