Hi Henry, I hope you are well.
To explain this, we first need to understand the relationship between Elasticsearch and OpenSearch.
Elasticsearch is a popular open-source search and analytics engine, used
for a wide range of applications. It's part of the Elastic Stack,
which includes other tools like Kibana, Beats, and Logstash.
OpenSearch is a community-driven, open-source search and analytics suite derived from Apache 2.0-licensed Elasticsearch 7.10.2 & Kibana 7.10.2. It was created by Amazon as a result of Elastic changing its licensing model for Elasticsearch and Kibana from Apache 2.0 to the Server Side Public License (SSPL). Amazon and other users felt the change was against the spirit of open-source software, and as a response, they forked the last Apache-licensed version of Elasticsearch and Kibana to create OpenSearch and OpenSearch Dashboards respectively.
Wazuh stack has as part Wazuh indexer and Wazuh dashboard, which you are using OpenSearch.
So, why does the quick installation use WazuhStack instead of Elasticsearch? There could be a couple of reasons for this:
Licensing: As mentioned above, Elastic's move to SSPL has been controversial, and some projects and organizations have elected to move to Wazuh stack to stay with a fully open-source product.
Testing: Our team conducts integration tests with the Wazuh stack in between releases. This ensures that the functionalities work seamlessly together as they are intended. Using Wazuh stack in the quick installation guide might help you maintain consistency and accuracy in your testing process
Regarding your confusion with the documentation, that is a valid
concern. It might be because the documentation hasn't been fully updated
yet, We are working on it.