chore(elk): define health and readiness checks for kibana

- status endpoint checks for readiness of underlying elastic nodes

modules/elk/jobspec.nomad.hcl

@@ -242,12 +242,20 @@ job "elk" {
         port     = "web"
         provider = "consul"
 
+        check {
+          type     = "tcp"
+          port     = "web"
+          interval = "5s"
+          timeout  = "2s"
+        }
+
         check {
           type      = "http"
           port      = "web"
           path      = "/api/status"
           interval  = "5s"
           timeout   = "2s"
+          on_update = "ignore"
         }
 
         tags = [