add settings reference to usage

cmd/cluster.go

@@ -26,6 +26,10 @@ import (
 	"github.com/urfave/cli/v3"
 )
 
+const (
+	SETTINGS = `https://www.elastic.co/docs/reference/elasticsearch/configuration-reference`
+)
+
 func Cluster(conf *cfg.Config) *cli.Command {
 	return &cli.Command{
 		Name:    "cluster",
@@ -176,7 +180,7 @@ func ClusterSettingsSet(conf *cfg.Config) *cli.Command {
 		Name:      "set",
 		Usage:     "set|update cluster settings",
 		Aliases:   []string{"set", "update"},
-		UsageText: "set [options] setting:value [setting:value ...]",
+		UsageText: "set [options] setting:value [setting:value ...]\n\nReference: " + SETTINGS,
 
 		Flags: []cli.Flag{
 			&cli.BoolFlag{