Apply missing backport of elastic#48985

Author: przemekwitek

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

@@ -14,6 +14,7 @@
 import org.elasticsearch.action.search.SearchResponse;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
 import org.elasticsearch.common.Nullable;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.index.query.QueryBuilders;
 import org.elasticsearch.search.sort.SortOrder;
@@ -202,7 +203,7 @@ protected void assertInferenceModelPersisted(String jobId) {
         SearchResponse searchResponse = client().prepareSearch(InferenceIndexConstants.LATEST_INDEX_NAME)
             .setQuery(QueryBuilders.boolQuery().filter(QueryBuilders.termQuery(TrainedModelConfig.TAGS.getPreferredName(), jobId)))
             .get();
-        assertThat(searchResponse.getHits().getHits(), arrayWithSize(1));
+        assertThat("Hits were: " + Strings.toString(searchResponse.getHits()), searchResponse.getHits().getHits(), arrayWithSize(1));
     }
 
     /**