App Search and Enterprise Search support a read-only mode, which allows a product operator to disable all writes from the application to the underlying Elasticsearch instance while keeping the application running and handling search requests. This mode could be used to perform maintenance on a deployment, create a consistent snapshot of the deployment’s data, or to perform an product upgrade without downtime.
For more information, check read-only mode in the App Search documentation.
Intro to Kibana
ELK for Logs & Metrics