[ML][TEST] Fix limits in AutodetectMemoryLimitIT (#42279)

Re-enable muted tests and accommodate recent backend changes
that result in higher memory usage being reported for a job
at the start of its life-cycle

Author: edsavage

x-pack/plugin/ml/qa/native-multi-node-tests/src/test/java/org/elasticsearch/xpack/ml/integration/AutodetectMemoryLimitIT.java

@@ -84,7 +84,6 @@ public void testTooManyPartitions() throws Exception {
         assertThat(modelSizeStats.getMemoryStatus(), equalTo(ModelSizeStats.MemoryStatus.HARD_LIMIT));
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/42207")
     public void testTooManyByFields() throws Exception {
         Detector.Builder detector = new Detector.Builder("count", null);
         detector.setByFieldName("user");
@@ -125,12 +124,11 @@ public void testTooManyByFields() throws Exception {
         // Assert we haven't violated the limit too much
         GetJobsStatsAction.Response.JobStats jobStats = getJobStats(job.getId()).get(0);
         ModelSizeStats modelSizeStats = jobStats.getModelSizeStats();
-        assertThat(modelSizeStats.getModelBytes(), lessThan(31500000L));
+        assertThat(modelSizeStats.getModelBytes(), lessThan(35000000L));
         assertThat(modelSizeStats.getModelBytes(), greaterThan(25000000L));
         assertThat(modelSizeStats.getMemoryStatus(), equalTo(ModelSizeStats.MemoryStatus.HARD_LIMIT));
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/42207")
     public void testTooManyByAndOverFields() throws Exception {
         Detector.Builder detector = new Detector.Builder("count", null);
         detector.setByFieldName("department");
@@ -175,12 +173,11 @@ public void testTooManyByAndOverFields() throws Exception {
         // Assert we haven't violated the limit too much
         GetJobsStatsAction.Response.JobStats jobStats = getJobStats(job.getId()).get(0);
         ModelSizeStats modelSizeStats = jobStats.getModelSizeStats();
-        assertThat(modelSizeStats.getModelBytes(), lessThan(31500000L));
+        assertThat(modelSizeStats.getModelBytes(), lessThan(33000000L));
         assertThat(modelSizeStats.getModelBytes(), greaterThan(24000000L));
         assertThat(modelSizeStats.getMemoryStatus(), equalTo(ModelSizeStats.MemoryStatus.HARD_LIMIT));
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/42207")
     public void testManyDistinctOverFields() throws Exception {
         Detector.Builder detector = new Detector.Builder("sum", "value");
         detector.setOverFieldName("user");
@@ -226,7 +223,7 @@ public void testManyDistinctOverFields() throws Exception {
         // Assert we haven't violated the limit too much
         GetJobsStatsAction.Response.JobStats jobStats = getJobStats(job.getId()).get(0);
         ModelSizeStats modelSizeStats = jobStats.getModelSizeStats();
-        assertThat(modelSizeStats.getModelBytes(), lessThan(116000000L));
+        assertThat(modelSizeStats.getModelBytes(), lessThan(117000000L));
         assertThat(modelSizeStats.getModelBytes(), greaterThan(90000000L));
         assertThat(modelSizeStats.getMemoryStatus(), equalTo(ModelSizeStats.MemoryStatus.HARD_LIMIT));
     }