Adds migrate to and modify data stream tests

Author: picandocodigo

tests/indices/migrate_modify_data_stream.yml

@@ -0,0 +1,45 @@
+---
+setup:
+  - do:
+      index:
+        index: 'my-data-index'
+        refresh: true
+        body:
+          name: 'Test data'
+          "@timestamp": "2023-12-20"
+  - do:
+      index:
+        index: 'my-data-index2'
+        refresh: true
+        body:
+          name: 'Test data'
+          "@timestamp": "2023-12-20"
+  - do:
+      indices.put_index_template:
+        name: 'my-data-template'
+        body:
+          index_patterns: ['my-data-alias*']
+          data_stream: {}
+  - do:
+      indices.put_alias:
+        index: 'my-data-index'
+        name: 'my-data-alias'
+---
+teardown:
+  - do:
+      indices.delete_data_stream:
+        name: 'my-data-alias'
+---
+'migrate to data stream and modify':
+  - do:
+      indices.migrate_to_data_stream:
+        name: 'my-data-alias'
+  - is_true: acknowledged
+  - do:
+      indices.modify_data_stream:
+        body:
+          actions:
+            - add_backing_index:
+                data_stream: 'my-data-alias'
+                index: 'my-data-index2'
+  - is_true: acknowledged