[Elastic Agent] Update path from policy change for Kibana connection. (…

…elastic#21804)

* Update path from policy change for kibana connection.

* Add changelog.

x-pack/elastic-agent/CHANGELOG.next.asciidoc

@@ -36,4 +36,5 @@
 - Add `elastic.agent.id` and `elastic.agent.version` to published events from filebeat and metricbeat {pull}21543[21543]
 - Add `upgrade` subcommand to perform upgrade of installed Elastic Agent {pull}21425[21425]
 - Update `fleet.yml` and Kibana hosts when a policy change updates the Kibana hosts {pull}21599[21599]
+- Update `fleet.kibana.path` from a POLICY_CHANGE {pull}21804[21804]
 - Removed `install-service.ps1` and `uninstall-service.ps1` from Windows .zip packaging {pull}21694[21694]

x-pack/elastic-agent/pkg/agent/application/handler_action_policy_change.go

@@ -73,14 +73,17 @@ func (h *handlerPolicyChange) handleKibanaHosts(c *config.Config) (err error) {
 
 	// only set protocol/hosts as that is all Fleet currently sends
 	prevProtocol := h.config.Fleet.Kibana.Protocol
+	prevPath := h.config.Fleet.Kibana.Path
 	prevHosts := h.config.Fleet.Kibana.Hosts
 	h.config.Fleet.Kibana.Protocol = cfg.Fleet.Kibana.Protocol
+	h.config.Fleet.Kibana.Path = cfg.Fleet.Kibana.Path
 	h.config.Fleet.Kibana.Hosts = cfg.Fleet.Kibana.Hosts
 
 	// rollback on failure
 	defer func() {
 		if err != nil {
 			h.config.Fleet.Kibana.Protocol = prevProtocol
+			h.config.Fleet.Kibana.Path = prevPath
 			h.config.Fleet.Kibana.Hosts = prevHosts
 		}
 	}()
@@ -113,6 +116,9 @@ func kibanaEqual(k1 *kibana.Config, k2 *kibana.Config) bool {
 	if k1.Protocol != k2.Protocol {
 		return false
 	}
+	if k1.Path != k2.Path {
+		return false
+	}
 
 	sort.Strings(k1.Hosts)
 	sort.Strings(k2.Hosts)