Update data-tiers.md for Data streams

Currently backing indices of data streams are not taken into account when disabling data tiers with searchable snapshots, this edit should serve as an additional warning some steps are required

Author: emrcbrn

manage-data/lifecycle/data-tiers.md

@@ -418,7 +418,7 @@ When data reaches the `cold` or `frozen` phases, it is automatically converted t
 6. Repeat steps 4 and 5 until all snapshots are restored to regular indices.
 7. Once all snapshots are restored, use `GET _cat/indices/<index-pattern>?v=true` to check that the restored indices are `green` and are correctly reflecting the expected `doc` and `store.size` counts.
 
-    If you are using data stream, you may need to use `GET _data_stream/<data-stream-name>` to get the list of the backing indices, and then specify them by using `GET _cat/indices/<backing-index-name>?v=true` to check.
+    If you are using data stream, you may need to use `GET _data_stream/<data-stream-name>` to get the list of the backing indices, and then specify them by using `GET _cat/indices/<backing-index-name>?v=true` to check. Please do [take the considerations](https://www.elastic.co/docs/deploy-manage/tools/snapshot-and-restore/restore-snapshot#considerations) into account when restoring backing indices of a datastream that you'd need to manually add them into your data stream or recreate your data stream.
 
 8. Once your data has completed restoration from searchable snapshots to the target data tier, `DELETE` searchable snapshot indices using the prefix from step 2.