.actionGet(suggestSettings.getIndicesTimeout());
                getAliasesResponse.getAliases().keySet().forEach(prevIndices::add);
            }

            final String mappingSource = getDefaultMappings();
            final String settingsSource = getDefaultIndexSettings();

// They can only be changed if absolutely necessary. For example if an inappropriate name was chosen in the past, or if the scope of the controller changes.
// When a name is changed, the old name should be aliased in app.ControllerDescriptor#GetAliases, while preserving all old aliases.
// This is done to achieve backwards compatibility
//
// USE CASES
// The following places should use the controller name constants, when:

			alphaFeatures.Insert(feature)
		}

	}

	for name, controller := range NewControllerDescriptors() {
		if len(controller.GetAliases()) == 0 {
			continue
		}

		requiredFeatureGates := controller.GetRequiredFeatureGates()
		if len(requiredFeatureGates) == 0 {
			continue
		}

	return append([]featuregate.Feature(nil), r.requiredFeatureGates...)
}

// GetAliases returns aliases to ensure backwards compatibility and should never be removed!
// Only addition of new aliases is allowed, and only when a canonical name is changed (please see CHANGE POLICY of controller names)
func (r *ControllerDescriptor) GetAliases() []string {
	return append([]string(nil), r.aliases...)
}

        String interfaces = isProvider ? " implements VersionNotationSupplier" : "";
        String versionsClassName = getClassName(classNode);
        Set<String> versionAliases = classNode.getAliases();
        writeLn("public static class " + versionsClassName + " extends VersionFactory " + interfaces + " {");
        writeLn();
        indent(() -> {