fix: avm/res/web/serverfarm support for elasticScaleEnabled property (

#2336)

## Description

Fixes #2335 

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## Type of Change

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- [ ] Update to CI Environment or utilities (Non-module affecting
changes)
- [x] Azure Verified Module updates:
- [x] Bugfix containing backwards-compatible bug fixes, and I have NOT
bumped the MAJOR or MINOR version in `version.json`:
- [x] Someone has opened a bug report issue, and I have included "Closes
#{bug_report_issue_number}" in the PR description.
- [ ] The bug was found by the module author, and no one has opened an
issue to report it yet.
- [ ] Feature update backwards compatible feature updates, and I have
bumped the MINOR version in `version.json`.
- [ ] Breaking changes and I have bumped the MAJOR version in
`version.json`.
  - [x] Update to documentation

## Checklist

- [x] I'm sure there are no other open Pull Requests for the same
update/change
- [x] I have run `Set-AVMModule` locally to generate the supporting
module files.
- [x] My corresponding pipelines / checks run clean and green without
any errors or warnings

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---------

Co-authored-by: Buddy <[email protected]>

avm/res/web/serverfarm/README.md

@@ -383,6 +383,7 @@ module serverfarm 'br/public:avm/res/web/serverfarm:<version>' = {
 | :-- | :-- | :-- |
 | [`appServiceEnvironmentId`](#parameter-appserviceenvironmentid) | string | The Resource ID of the App Service Environment to use for the App Service Plan. |
 | [`diagnosticSettings`](#parameter-diagnosticsettings) | array | The diagnostic settings of the service. |
+| [`elasticScaleEnabled`](#parameter-elasticscaleenabled) | bool | Enable/Disable ElasticScaleEnabled App Service Plan. |
 | [`enableTelemetry`](#parameter-enabletelemetry) | bool | Enable/Disable usage telemetry for module. |
 | [`kind`](#parameter-kind) | string | Kind of server OS. |
 | [`location`](#parameter-location) | string | Location for all resources. |
@@ -542,6 +543,14 @@ Resource ID of the diagnostic log analytics workspace. For security reasons, it
 - Required: No
 - Type: string
 
+### Parameter: `elasticScaleEnabled`
+
+Enable/Disable ElasticScaleEnabled App Service Plan.
+
+- Required: No
+- Type: bool
+- Default: `[greater(parameters('maximumElasticWorkerCount'), 1)]`
+
 ### Parameter: `enableTelemetry`
 
 Enable/Disable usage telemetry for module.

avm/res/web/serverfarm/main.bicep

@@ -46,6 +46,9 @@ param workerTierName string = ''
 @description('Optional. If true, apps assigned to this App Service plan can be scaled independently. If false, apps assigned to this App Service plan will scale to all instances of the plan.')
 param perSiteScaling bool = false
 
+@description('Optional. Enable/Disable ElasticScaleEnabled App Service Plan.')
+param elasticScaleEnabled bool = maximumElasticWorkerCount > 1
+
 @description('Optional. Maximum number of total workers allowed for this ElasticScaleEnabled App Service Plan.')
 param maximumElasticWorkerCount int = 1
 
@@ -136,6 +139,7 @@ resource appServicePlan 'Microsoft.Web/serverfarms@2022-09-01' = {
       : null
     perSiteScaling: perSiteScaling
     maximumElasticWorkerCount: maximumElasticWorkerCount
+    elasticScaleEnabled: elasticScaleEnabled
     reserved: reserved
     targetWorkerCount: targetWorkerCount
     targetWorkerSizeId: targetWorkerSize

avm/res/web/serverfarm/main.json

@@ -5,8 +5,8 @@
   "metadata": {
     "_generator": {
       "name": "bicep",
-      "version": "0.27.1.19265",
-      "templateHash": "3135450909992165111"
+      "version": "0.28.1.47646",
+      "templateHash": "10906771261412134199"
     },
     "name": "App Service Plan",
     "description": "This module deploys an App Service Plan.",
@@ -263,6 +263,13 @@
         "description": "Optional. If true, apps assigned to this App Service plan can be scaled independently. If false, apps assigned to this App Service plan will scale to all instances of the plan."
       }
     },
+    "elasticScaleEnabled": {
+      "type": "bool",
+      "defaultValue": "[greater(parameters('maximumElasticWorkerCount'), 1)]",
+      "metadata": {
+        "description": "Optional. Enable/Disable ElasticScaleEnabled App Service Plan."
+      }
+    },
     "maximumElasticWorkerCount": {
       "type": "int",
       "defaultValue": 1,
@@ -377,6 +384,7 @@
         "hostingEnvironmentProfile": "[if(not(empty(parameters('appServiceEnvironmentId'))), createObject('id', parameters('appServiceEnvironmentId')), null())]",
         "perSiteScaling": "[parameters('perSiteScaling')]",
         "maximumElasticWorkerCount": "[parameters('maximumElasticWorkerCount')]",
+        "elasticScaleEnabled": "[parameters('elasticScaleEnabled')]",
         "reserved": "[parameters('reserved')]",
         "targetWorkerCount": "[parameters('targetWorkerCount')]",
         "targetWorkerSizeId": "[parameters('targetWorkerSize')]",