[TESTS] Log what the _default_ template is in ElasticsearchIntegrationTest

src/test/java/org/elasticsearch/test/ElasticsearchIntegrationTest.java

@@ -411,6 +411,7 @@ public abstract class ElasticsearchIntegrationTest extends ElasticsearchTestCase
                     .setOrder(0)
                     .setSettings(randomSettingsBuilder);
             if (mappings != null) {
+                logger.info("test using _default_ mappings: [{}]", mappings.bytesStream().bytes().toUtf8());
                 putTemplate.addMapping("_default_", mappings);
             }
             assertAcked(putTemplate.execute().actionGet());