Add opensearch.internal to DefaultRemoteStoreSettings

Signed-off-by: Sachin Kale <kalsac@amazon.com>

Author: Sachin Kale

server/src/main/java/org/opensearch/indices/DefaultRemoteStoreSettings.java

@@ -13,6 +13,8 @@
 
 /**
  * Utility to provide a {@link RemoteStoreSettings} instance containing all defaults
+ *
+ * @opensearch.internal
  */
 public final class DefaultRemoteStoreSettings {
     private DefaultRemoteStoreSettings() {}