The cluster metadata stores a combination of public and internal state and configuration for a cluster. The unstructured content is undocumented unless explicitly stated elsewhere in the docs


cloud_id (string)
The cloud ID, an encoded string that provides other Elastic services with the necessary information to connect to this Elasticsearch and Kibana (only present if both exist)
endpoint (string)
The DNS name of the cluster endpoint, if available
last_modified (string as date-time, required)
The most recent time the cluster metadata was changed (ISO format in UTC)
raw (object)
An unstructured JSON representation of the public and internal state (can be filtered out via URL parameter)
version (integer as int32, required)
The resource version number of the cluster metadata