OpenSearch/rest-api-spec/api/cluster.node_info.json

{
  "cluster.node_info": {
    "documentation": "http://elasticsearch.org/guide/reference/api/admin-cluster-nodes-info/",
    "methods": ["GET"],
    "url": {
      "path": "/_nodes",
      "paths": ["/_nodes", "/_nodes/{node_id}", "/_nodes/{metric}", "/_nodes/{node_id}/{metric}"],
      "parts": {
        "node_id": {
          "type": "list",
          "description": "A comma-separated list of node IDs or names to limit the returned information; use `_local` to return information from the node you're connecting to, leave empty to get information from all nodes"
        },
        "metric": {
          "type": "list",
          "options": ["settings", "os", "process", "jvm", "thread_pool", "network", "transport", "http", "plugin"],
          "description": "A comma-separated list of metrics you wish returned. Leave empty to return all."
        }
      },
      "params": {
        "flat_settings": {
          "type": "boolean",
          "description": "Return settings in flat format (default: false)"
        }
      }
    },
    "body": null
  }
}