[ML] Fix failing test DetectionRulesTests.testEqualsAndHashcode (#111351)

Fixes #111308

Author: valeriy42

muted-tests.yml

@@ -108,9 +108,6 @@ tests:
 - class: org.elasticsearch.upgrades.LogsIndexModeFullClusterRestartIT
   method: testLogsIndexing {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/111306
-- class: org.elasticsearch.xpack.core.ml.job.config.DetectionRuleTests
-  method: testEqualsAndHashcode
-  issue: https://github.com/elastic/elasticsearch/issues/111308
 - class: org.elasticsearch.xpack.ml.integration.DatafeedJobsRestIT
   issue: https://github.com/elastic/elasticsearch/issues/111319
 - class: org.elasticsearch.xpack.esql.analysis.VerifierTests

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ml/job/config/DetectionRuleTests.java

@@ -139,6 +139,8 @@ protected DetectionRule mutateInstance(DetectionRule instance) {
 
         if (actions.contains(RuleAction.FORCE_TIME_SHIFT) && params.getForceTimeShift() == null) {
             params = new RuleParams(new RuleParamsForForceTimeShift(randomLong()));
+        } else if (actions.contains(RuleAction.FORCE_TIME_SHIFT) == false && params.getForceTimeShift() != null) {
+            params = new RuleParams();
         }
 
         return new DetectionRule.Builder(conditions).setActions(actions).setScope(scope).setParams(params).build();