API server should have a dedicated user in Elasticsearch #313
Description
Currently, API server connects to Elasticsearch via cluster admin credentials.
TODO in this ticket:
- Research Elasticsearch configuration / administration mechanisms regarding users and access permissions, in particular, in Elasticsearch Kubernetes operator
- Find an IaC-style solution to allow API server enough CRUD operations it needs over indices, aliases, ... but no administrative functions
- Extend configuration model, if needed (such as propagating user name) for plugging
- Deployment with adjustments