diff --git a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2017-11-15-preview/definitions/Common.json b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2017-11-15-preview/definitions/Common.json
index 6549b3558e6c..005287b48330 100644
--- a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2017-11-15-preview/definitions/Common.json
+++ b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2017-11-15-preview/definitions/Common.json
@@ -226,7 +226,6 @@
     "ConnectionInfo": {
       "type": "object",
       "description": "Defines the connection properties of a server",
-      "x-ms-discriminator-value": "Unknown",
       "properties": {
         "type": {
           "type": "string",
diff --git a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-15-preview/definitions/Common.json b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-15-preview/definitions/Common.json
index cf40cb1b52a2..fa4ab96ff2f6 100644
--- a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-15-preview/definitions/Common.json
+++ b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-15-preview/definitions/Common.json
@@ -226,7 +226,6 @@
     "ConnectionInfo": {
       "type": "object",
       "description": "Defines the connection properties of a server",
-      "x-ms-discriminator-value": "Unknown",
       "properties": {
         "type": {
           "type": "string",
diff --git a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-31-preview/definitions/Common.json b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-31-preview/definitions/Common.json
index b854b04aea65..44aaf3bc1a29 100644
--- a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-31-preview/definitions/Common.json
+++ b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-03-31-preview/definitions/Common.json
@@ -226,7 +226,6 @@
     "ConnectionInfo": {
       "type": "object",
       "description": "Defines the connection properties of a server",
-      "x-ms-discriminator-value": "Unknown",
       "properties": {
         "type": {
           "type": "string",
diff --git a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-07-15-preview/definitions/Common.json b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-07-15-preview/definitions/Common.json
index 962a5b8cf42d..651b9c6840cf 100644
--- a/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-07-15-preview/definitions/Common.json
+++ b/specification/datamigration/resource-manager/Microsoft.DataMigration/preview/2018-07-15-preview/definitions/Common.json
@@ -230,7 +230,6 @@
     "ConnectionInfo": {
       "type": "object",
       "description": "Defines the connection properties of a server",
-      "x-ms-discriminator-value": "Unknown",
       "properties": {
         "type": {
           "type": "string",
diff --git a/specification/datamigration/resource-manager/Microsoft.DataMigration/stable/2018-04-19/definitions/Common.json b/specification/datamigration/resource-manager/Microsoft.DataMigration/stable/2018-04-19/definitions/Common.json
index 5e7c7e93e173..5a446ff1378d 100644
--- a/specification/datamigration/resource-manager/Microsoft.DataMigration/stable/2018-04-19/definitions/Common.json
+++ b/specification/datamigration/resource-manager/Microsoft.DataMigration/stable/2018-04-19/definitions/Common.json
@@ -241,7 +241,6 @@
     "ConnectionInfo": {
       "type": "object",
       "description": "Defines the connection properties of a server",
-      "x-ms-discriminator-value": "Unknown",
       "properties": {
         "type": {
           "type": "string",