[Transform] Lower loglevel of 3 transform-related error messages from ERROR to WARN (elastic#134985)

Author: przemekwitek

x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/persistence/AuthorizationStatePersistenceUtils.java

@@ -130,7 +130,7 @@ public static void persistAuthState(
  },
  error -> {
  String msg = TransformMessages.getMessage(TransformMessages.FAILED_TO_LOAD_TRANSFORM_STATE, transformId);
- logger.error(msg, error);
+ logger.warn(msg, error);
  listener.onFailure(error);
  }
  );

x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/persistence/TransformIndex.java

@@ -213,7 +213,7 @@ static void createDestinationIndex(
  config.getDestination().getIndex(),
  config.getId()
  );
- logger.error(message, e);
+ logger.warn(message, e);
  listener.onFailure(new RuntimeException(message, e));
  })
  );
@@ -255,7 +255,7 @@ static void setUpDestinationAliases(Client client, TransformConfig config, Actio
  config.getDestination().getIndex(),
  config.getId()
  );
- logger.error(message, e);
+ logger.warn(message, e);
  listener.onFailure(new RuntimeException(message, e));
  })
  );