Add default accountid (#19417)

Similar PR was merged into Main.
s360 ticket still leading to this branch - so we are pushing the pull request with the same fixes here.

Author: tshoham

specification/vi/resource-manager/Microsoft.VideoIndexer/preview/2021-10-27-preview/vi.json

@@ -782,8 +782,9 @@
           "example": "2b9bcf6d-39d5-460a-a6bb-7b40b7ccf139"
         },
         "accountId": {
-          "description": "The account's data-plane ID",
+          "description": "The account's data-plane ID. This can be set only when connecting an existing classic account",
           "type": "string",
+          "default": "00000000-0000-0000-0000-000000000000",
           "example": "3575690b-a569-449c-ab7b-11020f948f76"
         },
         "accountName": {

specification/vi/resource-manager/Microsoft.VideoIndexer/preview/2021-11-10-preview/vi.json

@@ -782,8 +782,9 @@
           "example": "2b9bcf6d-39d5-460a-a6bb-7b40b7ccf139"
         },
         "accountId": {
-          "description": "The account's data-plane ID",
+          "description": "The account's data-plane ID. This can be set only when connecting an existing classic account",
           "type": "string",
+          "default": "00000000-0000-0000-0000-000000000000",
           "example": "3575690b-a569-449c-ab7b-11020f948f76"
         },
         "accountName": {