In search of a cluster health diagnosis: Introducing the Elasticsearch Health API

What this post added

Introduces the new Elasticsearch Health API, which performs root cause analysis for cluster health issues. Details the API's design principles, operating modes (high-level and detailed reporting), and the concept of health indicators. Explains individual indicators such as master_is_stable, repository_integrity, shards_availability, disk, ilm, and slm, along with their respective statuses (green, yellow, red, unknown) and symptoms. Provides examples of API responses for a healthy cluster.