v7.0-beta.211

• Issue #2912 : Prevent users from renaming feeds as this breaks the link with the files stored on the file system.

• Issue #2903 : Fix pipeline structure inheritance to hide dead inherited links.

• Issue #2906 : Fix rolling appenders failing due to "no logged in user".

• Issue #2916 : Change LMDB thread interrupted messages from ERROR to DEBUG.

• Issue #2914 : Propagate useAsRead to sub tasks.

• Issue #2877 : Handle missing index when performing shard retention.

• Issue #2896 : Improve application instance error handling.