[Tempfix] Switching default API version to release stable SDKs (#43928)

* Switching default API version to release stable SDKs

* [Bugfix] Use standard ArmResourcePatchSync for FleetResource update

Replace custom Legacy.CustomPatchSync (hand-written FleetResourceUpdate, OptionalRequestBody) with the standard tracked-resource patch. The PATCH body now uses the standard tags + properties envelope and is required, matching tracked-resource conventions.

* Revert "Switching default API version to release stable SDKs"

This reverts commit 55162ae.

* [Temporary] Adding stable API version for SDK release

* Review comment - kept the original envelope and added tags

Author: pjohari-ms

specification/cosmos-db/resource-manager/Microsoft.DocumentDB/DocumentDB/FleetResource.tsp

@@ -38,12 +38,7 @@ interface FleetResources {
   /**
    * Updates the properties of an existing Azure Cosmos DB Fleet.
    */
-  @patch(#{ implicitOptionality: false })
-  update is Azure.ResourceManager.Legacy.CustomPatchSync<
-    FleetResource,
-    PatchModel = FleetResourceUpdate,
-    OptionalRequestBody = true
-  >;
+  update is ArmCustomPatchSync<FleetResource, FleetResourceUpdate>;
 
   /**
    * Deletes an existing Azure Cosmos DB Fleet.

specification/cosmos-db/resource-manager/Microsoft.DocumentDB/DocumentDB/models.tsp

@@ -8611,8 +8611,13 @@ model FleetResourceProperties {
 /**
  * Represents a fleet resource for updates.
  */
-#suppress "@azure-tools/typespec-azure-resource-manager/patch-envelope" "FIXME: Update justification, follow aka.ms/tsp/conversion-fix for details"
 model FleetResourceUpdate {
+  /**
+   * Resource tags.
+   */
+  #suppress "@azure-tools/typespec-azure-resource-manager/arm-no-record" "Standard ARM resource tags use Record<string>."
+  tags?: Record<string>;
+
   /**
    * Properties to update Azure Cosmos DB fleet resource.
    */

specification/cosmos-db/resource-manager/Microsoft.DocumentDB/DocumentDB/preview/2026-04-01-preview/openapi.json

@@ -18481,7 +18481,7 @@
             "name": "body",
             "in": "body",
             "description": "The parameters to provide for the current fleet.",
-            "required": false,
+            "required": true,
             "schema": {
               "$ref": "#/definitions/FleetResourceUpdate"
             }
@@ -26016,6 +26016,13 @@
       "type": "object",
       "description": "Represents a fleet resource for updates.",
       "properties": {
+        "tags": {
+          "type": "object",
+          "description": "Resource tags.",
+          "additionalProperties": {
+            "type": "string"
+          }
+        },
         "properties": {
           "$ref": "#/definitions/FleetResourceProperties",
           "description": "Properties to update Azure Cosmos DB fleet resource.",

specification/cosmos-db/resource-manager/Microsoft.DocumentDB/DocumentDB/stable/2026-03-15/openapi.json

@@ -15011,7 +15011,7 @@
             "name": "body",
             "in": "body",
             "description": "The parameters to provide for the current fleet.",
-            "required": false,
+            "required": true,
             "schema": {
               "$ref": "#/definitions/FleetResourceUpdate"
             }
@@ -18951,6 +18951,13 @@
       "type": "object",
       "description": "Represents a fleet resource for updates.",
       "properties": {
+        "tags": {
+          "type": "object",
+          "description": "Resource tags.",
+          "additionalProperties": {
+            "type": "string"
+          }
+        },
         "properties": {
           "$ref": "#/definitions/FleetResourceProperties",
           "description": "Properties to update Azure Cosmos DB fleet resource.",

specification/cosmos-db/resource-manager/Microsoft.DocumentDB/DocumentDB/tspconfig.yaml

@@ -21,13 +21,15 @@ options:
     generate-test: true
     generate-sample: true
     flavor: azure
+    api-version: "2026-03-15"
   "@azure-tools/typespec-ts":
     emitter-output-dir: "{output-dir}/{service-dir}/arm-cosmosdb"
     compatibility-lro: true
     package-details:
       name: "@azure/arm-cosmosdb"
     flavor: azure
     experimental-extensible-enums: true
+    api-version: "2026-03-15"
   "@azure-tools/typespec-java":
     service-dir: "sdk/cosmos"
     emitter-output-dir: "{output-dir}/{service-dir}/azure-resourcemanager-cosmos"
@@ -41,6 +43,7 @@ options:
     customization-class: customization/src/main/java/CosmosCustomization.java
     rename-model:
       DatabaseAccountGetPropertiesDatabaseAccountOfferType: DatabaseAccountOfferType
+    api-version: "2026-03-15"
   "@azure-tools/typespec-go":
     module: "github.com/Azure/azure-sdk-for-go/{service-dir}/armcosmos/v4"
     service-dir: "sdk/resourcemanager/cosmos"
@@ -51,10 +54,12 @@ options:
     flavor: azure
     generate-samples: true
     head-as-boolean: true
+    api-version: "2026-03-15"
   "@azure-typespec/http-client-csharp-mgmt":
     enable-wire-path-attribute: true
     namespace: "Azure.ResourceManager.CosmosDB"
     emitter-output-dir: "{output-dir}/{service-dir}/{namespace}"
+    api-version: "2026-03-15"
 linter:
   extends:
     - "@azure-tools/typespec-azure-rulesets/resource-manager"