Mark migrate_reindex APIs as public and stable (elastic#133912) (elastic#134193)

* Mark migrate_reindex APIs as public

* Add indices.create_from too

* Mark migrate_reindex APIs as stable

* Fix indices.get_migrate_reindex_status stability

Author: pquentin

rest-api-spec/src/main/resources/rest-api-spec/api/indices.cancel_migrate_reindex.json

@@ -4,8 +4,8 @@
       "url":"https://www.elastic.co/guide/en/elasticsearch/reference/8.19/migrate-data-stream.html",
       "description":"Cancel a migration reindex operation"
     },
-    "stability":"experimental",
-    "visibility":"private",
+    "stability":"stable",
+    "visibility":"public",
     "headers":{
       "accept": [ "application/json"],
       "content_type": ["application/json"]

rest-api-spec/src/main/resources/rest-api-spec/api/indices.create_from.json

@@ -4,8 +4,8 @@
       "url":"https://www.elastic.co/guide/en/elasticsearch/reference/8.19/migrate-data-stream.html",
       "description":"Create an index from a source index"
     },
-    "stability":"experimental",
-    "visibility":"private",
+    "stability":"stable",
+    "visibility":"public",
     "headers":{
       "accept": [ "application/json"],
       "content_type": ["application/json"]

rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_migrate_reindex_status.json

@@ -4,8 +4,8 @@
       "url":"https://www.elastic.co/guide/en/elasticsearch/reference/8.19/migrate-data-stream.html",
       "description":"Get the migration reindexing status"
     },
-    "stability":"experimental",
-    "visibility":"private",
+    "stability":"stable",
+    "visibility":"public",
     "headers":{
       "accept": [ "application/json"],
       "content_type": ["application/json"]

rest-api-spec/src/main/resources/rest-api-spec/api/indices.migrate_reindex.json

@@ -4,8 +4,8 @@
       "url":"https://www.elastic.co/guide/en/elasticsearch/reference/8.19/migrate-data-stream.html",
       "description":"Reindex legacy backing indices"
     },
-    "stability":"experimental",
-    "visibility":"private",
+    "stability":"stable",
+    "visibility":"public",
     "headers":{
       "accept": [ "application/json"],
       "content_type": ["application/json"]