Make accountIds a required field in GetRemainingFreeTrialDays API to reflect service behavior.

Author: aws-sdk-dotnet-automation

generator/ServiceModels/guardduty/guardduty-2017-11-28.api.json

@@ -5134,7 +5134,10 @@
     },
     "GetRemainingFreeTrialDaysRequest":{
       "type":"structure",
-      "required":["DetectorId"],
+      "required":[
+        "AccountIds",
+        "DetectorId"
+      ],
       "members":{
         "DetectorId":{
           "shape":"DetectorId",

generator/ServiceModels/guardduty/guardduty-2017-11-28.normal.json

@@ -5839,7 +5839,10 @@
     },
     "GetRemainingFreeTrialDaysRequest":{
       "type":"structure",
-      "required":["DetectorId"],
+      "required":[
+        "AccountIds",
+        "DetectorId"
+      ],
       "members":{
         "DetectorId":{
           "shape":"DetectorId",

sdk/src/Services/GuardDuty/Generated/Model/GetRemainingFreeTrialDaysRequest.cs

@@ -49,7 +49,7 @@ public partial class GetRemainingFreeTrialDaysRequest : AmazonGuardDutyRequest
         /// to distinguish between a property not set or a property being empty to clear out a value. To retain the previous
         /// SDK behavior set the AWSConfigs.InitializeCollections static property to true.
         /// </summary>
-        [AWSProperty(Min=1, Max=50)]
+        [AWSProperty(Required=true, Min=1, Max=50)]
         public List<string> AccountIds
         {
             get { return this._accountIds; }