Update stack monitoring templates for Stack 9 release (fix BWC test cases)

Author: consulthys

test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java

@@ -822,7 +822,7 @@ protected Set<String> preserveILMPolicyIds() {
             ".fleet-file-tohost-data-ilm-policy",
             ".fleet-file-tohost-meta-ilm-policy",
             ".deprecation-indexing-ilm-policy",
-            ".monitoring-9-ilm-policy",
+            ".monitoring-ilm-policy",
             "behavioral_analytics-events-default_policy",
             "logs-apm.app_logs-default_policy",
             "logs-apm.error_logs-default_policy",

x-pack/plugin/monitoring/src/main/java/org/elasticsearch/xpack/monitoring/MonitoringTemplateRegistry.java

@@ -66,7 +66,7 @@ public class MonitoringTemplateRegistry extends IndexTemplateRegistry {
      * The stack monitoring ILM policy information. The template variables for the ILM policy are generated when the
      * registry is created so that we can pick a default retention value that is sensitive to legacy monitoring settings.
      */
-    public static final String MONITORING_POLICY_NAME = ".monitoring-9-ilm-policy";
+    public static final String MONITORING_POLICY_NAME = ".monitoring-ilm-policy";
     private static final String MONITORING_POLICY_NAME_VARIABLE = "xpack.stack.monitoring.policy.name";
     public static final String MONITORING_POLICY_DEFAULT_RETENTION = "3d";
     private static final String MONITORING_POLICY_RETENTION_VARIABLE = "xpack.stack.monitoring.history.duration";