[ReleasePR vi] ADDED DEFAULT VALUE TO accountId in (#2415)

Create to sync Azure/azure-rest-api-specs#19348
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/vi?expand=1)

Author: msftbot[bot]

schemas/2021-10-18-preview/Microsoft.VideoIndexer.json

@@ -90,7 +90,8 @@
       "properties": {
         "accountId": {
           "type": "string",
-          "description": "The account's data-plane ID"
+          "default": "00000000-0000-0000-0000-000000000000",
+          "description": "The account's data-plane ID. This can be set only when connecting an existing classic account"
         },
         "mediaServices": {
           "oneOf": [

schemas/2021-10-27-preview/Microsoft.VideoIndexer.json

@@ -90,7 +90,8 @@
       "properties": {
         "accountId": {
           "type": "string",
-          "description": "The account's data-plane ID"
+          "default": "00000000-0000-0000-0000-000000000000",
+          "description": "The account's data-plane ID. This can be set only when connecting an existing classic account"
         },
         "mediaServices": {
           "oneOf": [

schemas/2021-11-10-preview/Microsoft.VideoIndexer.json

@@ -90,7 +90,8 @@
       "properties": {
         "accountId": {
           "type": "string",
-          "description": "The account's data-plane ID"
+          "default": "00000000-0000-0000-0000-000000000000",
+          "description": "The account's data-plane ID. This can be set only when connecting an existing classic account"
         },
         "mediaServices": {
           "oneOf": [

schemas/2022-04-13-preview/Microsoft.VideoIndexer.json

@@ -91,7 +91,8 @@
       "properties": {
         "accountId": {
           "type": "string",
-          "description": "The account's data-plane ID"
+          "default": "00000000-0000-0000-0000-000000000000",
+          "description": "The account's data-plane ID. This can be set only when connecting an existing classic account"
         },
         "mediaServices": {
           "oneOf": [