diff --git a/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/sparkJob.json b/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/sparkJob.json
index 7f1d16f415b7..50d1fe089952 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/sparkJob.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/sparkJob.json
@@ -711,14 +711,16 @@
         },
         "appId": {
           "type": "string",
-          "description": "The application id of this session"
+          "description": "The application id of this session",
+          "x-nullable": true
         },
         "appInfo": {
           "type": "object",
           "additionalProperties": {
             "type": "string"
           },
-          "description": "The detailed application info."
+          "description": "The detailed application info.",
+          "x-nullable": true
         },
         "state": {
           "type": "string",
@@ -731,7 +733,8 @@
           "items": {
             "type": "string"
           },
-          "description": "The log lines."
+          "description": "The log lines.",
+          "x-nullable": true
         }
       },
       "required": [
@@ -744,38 +747,45 @@
         "notStartedAt": {
           "format": "date-time",
           "type": "string",
-          "description": "the time that at which \"not_started\" livy state was first seen."
+          "description": "the time that at which \"not_started\" livy state was first seen.",
+          "x-nullable": true
         },
         "startingAt": {
           "format": "date-time",
           "type": "string",
-          "description": "the time that at which \"starting\" livy state was first seen."
+          "description": "the time that at which \"starting\" livy state was first seen.",
+          "x-nullable": true
         },
         "runningAt": {
           "format": "date-time",
           "type": "string",
-          "description": "the time that at which \"running\" livy state was first seen."
+          "description": "the time that at which \"running\" livy state was first seen.",
+          "x-nullable": true
         },
         "deadAt": {
           "format": "date-time",
           "type": "string",
-          "description": "time that at which \"dead\" livy state was first seen."
+          "description": "time that at which \"dead\" livy state was first seen.",
+          "x-nullable": true
         },
         "successAt": {
           "format": "date-time",
           "type": "string",
-          "description": "the time that at which \"success\" livy state was first seen."
+          "description": "the time that at which \"success\" livy state was first seen.",
+          "x-nullable": true
         },
         "killedAt": {
           "x-ms-client-name": "terminatedAt",
           "format": "date-time",
           "type": "string",
-          "description": "the time that at which \"killed\" livy state was first seen."
+          "description": "the time that at which \"killed\" livy state was first seen.",
+          "x-nullable": true
         },
         "recoveringAt": {
           "format": "date-time",
           "type": "string",
-          "description": "the time that at which \"recovering\" livy state was first seen."
+          "description": "the time that at which \"recovering\" livy state was first seen.",
+          "x-nullable": true
         },
         "currentState": {
           "type": "string",
@@ -791,15 +801,18 @@
       "properties": {
         "submittedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "scheduledAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "endedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "cancellationRequestedAt": {
           "format": "date-time",
@@ -824,23 +837,28 @@
       "properties": {
         "preparationStartedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "resourceAcquisitionStartedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "submissionStartedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "monitoringStartedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "cleanupStartedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "currentState": {
           "enum": [
@@ -1150,13 +1168,15 @@
           "type": "integer"
         },
         "appId": {
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "appInfo": {
           "type": "object",
           "additionalProperties": {
             "type": "string"
-          }
+          },
+          "x-nullable": true
         },
         "state": {
           "type": "string"
@@ -1167,7 +1187,8 @@
           "type": "array",
           "items": {
             "type": "string"
-          }
+          },
+          "x-nullable": true
         }
       },
       "required": [
@@ -1179,40 +1200,49 @@
       "properties": {
         "notStartedAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "startingAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "idleAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "deadAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "shuttingDownAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "killedAt": {
           "x-ms-client-name": "terminatedAt",
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "recoveringAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "busyAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "errorAt": {
           "format": "date-time",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "currentState": {
           "type": "string"