[ML] Fix AutodetectMemoryLimitIT.testManyDistinctOverFields (#105727) (#105734)

It seems that the changes of https://github.com/elastic/ml-cpp/pull/2585
combined with the randomness of the test could cause it to fail
very occasionally, and by a tiny percentage over the expected
upper bound. This change reenables the test by very slightly
increasing the upper bound.

Fixes #105347

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

@@ -181,7 +181,6 @@ public class AutodetectMemoryLimitIT extends MlNativeAutodetectIntegTestCase {
         assertThat(modelSizeStats.getMemoryStatus(), equalTo(ModelSizeStats.MemoryStatus.HARD_LIMIT));
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/105347")
     public void testManyDistinctOverFields() throws Exception {
         Detector.Builder detector = new Detector.Builder("sum", "value");
         detector.setOverFieldName("user");
@@ -226,7 +225,7 @@ public class AutodetectMemoryLimitIT extends MlNativeAutodetectIntegTestCase {
         // 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(120000000L));
+        assertThat(modelSizeStats.getModelBytes(), lessThan(120500000L));
         assertThat(modelSizeStats.getModelBytes(), greaterThan(90000000L));
         assertThat(modelSizeStats.getMemoryStatus(), equalTo(ModelSizeStats.MemoryStatus.HARD_LIMIT));
     }