Fix failing tests

Author: przemekwitek

client/rest-high-level/src/test/java/org/elasticsearch/client/MachineLearningIT.java

@@ -1927,7 +1927,7 @@ public void testEvaluateDataFrame_Classification() throws IOException {
 
             AucRocMetric.Result aucRocResult = evaluateDataFrameResponse.getMetricByName(AucRocMetric.NAME);
             assertThat(aucRocResult.getMetricName(), equalTo(AucRocMetric.NAME));
-            assertThat(aucRocResult.getScore(), closeTo(0.99995, 1e-9));
+            assertThat(aucRocResult.getScore(), closeTo(0.9299, 1e-9));
             assertNotNull(aucRocResult.getCurve());
         }
         {  // Accuracy

client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/MlClientDocumentationIT.java

@@ -3561,7 +3561,7 @@ public void testEvaluateDataFrame_Classification() throws Exception {
             assertThat(otherClassesCount, equalTo(0L));
 
             assertThat(aucRocResult.getMetricName(), equalTo(AucRocMetric.NAME));
-            assertThat(aucRocScore, equalTo(0.2625));
+            assertThat(aucRocScore, equalTo(0.7162000000000013));
         }
     }
 

x-pack/plugin/src/test/resources/rest-api-spec/test/ml/evaluate_data_frame.yml

@@ -685,7 +685,7 @@ setup:
 ---
 "Test classification auc_roc given predicted_class_field is never equal to mouse":
   - do:
-      catch: /\[auc_roc\] requires that \[mouse\] appears as one of the \[ml.top_classes.class_name\] for every document (appeared for 0 out of 8)/
+      catch: /\[auc_roc\] requires that \[mouse\] appears as one of the \[ml.top_classes.class_name\] for every document \(appeared for 0 out of 8\)/
       ml.evaluate_data_frame:
         body:  >
           {