[8.18][ML] Update minimum supported snapshot version for Machine Learning jobs to 8.3.0 (elastic#118166)

Change the minimum supported snapshot version for Machine Learning jobs to 8.3.0, ensuring compatibility with the latest snapshot format. Adjust related references throughout the codebase accordingly.

Author: valeriy42

docs/changelog/118166.yaml

@@ -0,0 +1,5 @@
+pr: 118166
+summary: Update minimum supported snapshot version for Machine Learning jobs to 8.3.0
+area: Machine Learning
+type: upgrade
+issues: []

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/MachineLearningField.java

@@ -67,12 +67,12 @@ public final class MachineLearningField {
         License.OperationMode.PLATINUM
     );
 
-    // Ideally this would be 7.0.0, but it has to be 6.4.0 because due to an oversight it's impossible
+    // Ideally this would be 8.3.0, but it has to be 6.4.0 because due to an oversight it's impossible
     // for the Java code to distinguish the model states for versions 6.4.0 to 7.9.3 inclusive.
     public static final MlConfigVersion MIN_CHECKED_SUPPORTED_SNAPSHOT_VERSION = MlConfigVersion.fromString("6.4.0");
-    // We tell the user we support model snapshots newer than 7.0.0 as that's the major version
-    // boundary, even though behind the scenes we have to support back to 6.4.0.
-    public static final MlConfigVersion MIN_REPORTED_SUPPORTED_SNAPSHOT_VERSION = MlConfigVersion.V_7_0_0;
+    // We tell the user we support model snapshots newer than 8.3.0 as that's the version with the last format change,
+    // even though behind the scenes we have to support back to 6.4.0.
+    public static final MlConfigVersion MIN_REPORTED_SUPPORTED_SNAPSHOT_VERSION = MlConfigVersion.V_8_3_0;
 
     private MachineLearningField() {}
 

x-pack/plugin/deprecation/qa/rest/src/javaRestTest/java/org/elasticsearch/xpack/deprecation/MlDeprecationIT.java

@@ -63,7 +63,7 @@ public void testMlDeprecationChecks() throws Exception {
         indexDoc(
             ".ml-anomalies-.write-" + jobId,
             jobId + "_model_snapshot_2",
-            "{\"job_id\":\"deprecation_check_job\",\"snapshot_id\":\"2\",\"snapshot_doc_count\":1,\"min_version\":\"8.0.0\"}"
+            "{\"job_id\":\"deprecation_check_job\",\"snapshot_id\":\"2\",\"snapshot_doc_count\":1,\"min_version\":\"8.3.0\"}"
         );
         client().performRequest(new Request("POST", "/.ml-anomalies-*/_refresh"));
 

x-pack/plugin/ml/src/internalClusterTest/java/org/elasticsearch/xpack/ml/integration/AnomalyJobCRUDIT.java

@@ -195,7 +195,7 @@ public void testOpenJobWithOldSnapshot() {
         assertThat(
             ex.getMessage(),
             containsString(
-                "[open-job-with-old-model-snapshot] job model snapshot [snap_1] has min version before [7.0.0], "
+                "[open-job-with-old-model-snapshot] job model snapshot [snap_1] has min version before [8.3.0], "
                     + "please revert to a newer model snapshot or reset the job"
             )
         );