diff --git a/plugin/src/main/java/org/elasticsearch/license/XPackLicenseState.java b/plugin/src/main/java/org/elasticsearch/license/XPackLicenseState.java
index 7dd392a1b16..de331f153c2 100644
--- a/plugin/src/main/java/org/elasticsearch/license/XPackLicenseState.java
+++ b/plugin/src/main/java/org/elasticsearch/license/XPackLicenseState.java
@@ -71,6 +71,7 @@ public class XPackLicenseState {
         messages.put(XPackPlugin.WATCHER, XPackLicenseState::watcherAcknowledgementMessages);
         messages.put(XPackPlugin.MONITORING, XPackLicenseState::monitoringAcknowledgementMessages);
         messages.put(XPackPlugin.GRAPH, XPackLicenseState::graphAcknowledgementMessages);
+        messages.put(XPackPlugin.MACHINE_LEARNING, XPackLicenseState::machineLearningAcknowledgementMessages);
         messages.put(XPackPlugin.LOGSTASH, XPackLicenseState::logstashAcknowledgementMessages);
         ACKNOWLEDGMENT_MESSAGES = Collections.unmodifiableMap(messages);
     }
@@ -177,6 +178,21 @@ public class XPackLicenseState {
         return Strings.EMPTY_ARRAY;
     }
 
+    private static String[] machineLearningAcknowledgementMessages(OperationMode currentMode, OperationMode newMode) {
+        switch (newMode) {
+            case BASIC:
+            case STANDARD:
+            case GOLD:
+                switch (currentMode) {
+                    case TRIAL:
+                    case PLATINUM:
+                        return new String[] { "Machine learning will be disabled" };
+                }
+                break;
+        }
+        return Strings.EMPTY_ARRAY;
+    }
+
     private static String[] logstashAcknowledgementMessages(OperationMode currentMode, OperationMode newMode) {
         switch (newMode) {
             case BASIC: