> It is a drop-in replacement for Elasticsearch if you are just ingesting data using APIs and searching using kibana (Kibana is not supported nor required with OpenObserve. OpenObserve provides its own UI which does not require separate installation unlike kibana).

This seems contradictory. If OpenObserve doesn't support Kibana, how can it be a drop-in replacement for Elasticsearch queried using Kibana? Even if the OpenObserve UI has similar features, I can't just replace Elasticsearch with OpenObserve and keep the rest of my workflow the same, which I would consider a precondition to call something a drop-in replacement.