Use the correct warning

Author: gmarouli

qa/rolling-upgrade/src/javaRestTest/java/org/elasticsearch/upgrades/SourceModeRollingUpgradeIT.java

@@ -46,7 +46,7 @@ public void testConfigureStoredSourceBeforeIndexCreationLegacy() throws IOExcept
                   }
                 }""";
             var putComponentTemplateRequest = new Request("PUT", "/_component_template/" + templateName);
-            putComponentTemplateRequest.setOptions(expectWarnings(SourceFieldMapper.DEPRECATION_WARNING_TITLE));
+            putComponentTemplateRequest.setOptions(expectWarnings(SourceFieldMapper.DEPRECATION_WARNING));
             putComponentTemplateRequest.setJsonEntity(storedSourceMapping);
             assertOK(client().performRequest(putComponentTemplateRequest));
             assertDeprecationWarningForTemplate(templateName);
@@ -70,7 +70,7 @@ public void testConfigureStoredSourceWhenIndexIsCreatedLegacy() throws IOExcepti
                   }
                 }""";
             var putComponentTemplateRequest = new Request("PUT", "/_component_template/" + templateName);
-            putComponentTemplateRequest.setOptions(expectWarnings(SourceFieldMapper.DEPRECATION_WARNING_TITLE));
+            putComponentTemplateRequest.setOptions(expectWarnings(SourceFieldMapper.DEPRECATION_WARNING));
             putComponentTemplateRequest.setJsonEntity(storedSourceMapping);
             assertOK(client().performRequest(putComponentTemplateRequest));
             assertDeprecationWarningForTemplate(templateName);