Add native blob soft delete (Azure#10308)

* swagger changes for native soft delete

* revert track1 changes

Author: mattgotteiner

specification/search/data-plane/Azure.Search/preview/2019-05-06-preview/searchservice.json

@@ -5628,6 +5628,15 @@
         }
       }
     },
+    "NativeBlobSoftDeleteDeletionDetectionPolicy": {
+      "description": "Defines a data deletion detection policy that captures deletions using the soft-deletion capability of Azure Blob Storage",
+      "x-ms-discriminator-value": "#Microsoft.Azure.Search.NativeBlobSoftDeleteDeletionDetectionPolicy",
+      "allOf": [
+        {
+          "$ref": "#/definitions/DataDeletionDetectionPolicy"
+        }
+      ]
+    },
     "SearchIndexerDataSourceType": {
       "type": "string",
       "enum": [

specification/search/data-plane/Azure.Search/preview/2020-06-30-Preview/searchservice.json

@@ -5630,6 +5630,15 @@
         }
       }
     },
+    "NativeBlobSoftDeleteDeletionDetectionPolicy": {
+      "description": "Defines a data deletion detection policy that captures deletions using the soft-deletion capability of Azure Blob Storage",
+      "x-ms-discriminator-value": "#Microsoft.Azure.Search.NativeBlobSoftDeleteDeletionDetectionPolicy",
+      "allOf": [
+        {
+          "$ref": "#/definitions/DataDeletionDetectionPolicy"
+        }
+      ]
+    },
     "SearchIndexerDataSourceType": {
       "type": "string",
       "enum": [

specification/search/data-plane/Azure.Search/preview/2020-06-30/searchservice.json

@@ -5630,6 +5630,15 @@
         }
       }
     },
+    "NativeBlobSoftDeleteDeletionDetectionPolicy": {
+      "description": "Defines a data deletion detection policy that captures deletions using the soft-deletion capability of Azure Blob Storage",
+      "x-ms-discriminator-value": "#Microsoft.Azure.Search.NativeBlobSoftDeleteDeletionDetectionPolicy",
+      "allOf": [
+        {
+          "$ref": "#/definitions/DataDeletionDetectionPolicy"
+        }
+      ]
+    },
     "SearchIndexerDataSourceType": {
       "type": "string",
       "enum": [

specification/search/data-plane/Azure.Search/stable/2019-05-06/searchservice.json

@@ -3774,6 +3774,15 @@
         }
       }
     },
+    "NativeBlobSoftDeleteDeletionDetectionPolicy": {
+      "description": "Defines a data deletion detection policy that captures deletions using the soft-deletion capability of Azure Blob Storage",
+      "x-ms-discriminator-value": "#Microsoft.Azure.Search.NativeBlobSoftDeleteDeletionDetectionPolicy",
+      "allOf": [
+        {
+          "$ref": "#/definitions/DataDeletionDetectionPolicy"
+        }
+      ]
+    },
     "DataSourceType": {
       "type": "string",
       "enum": [