diff --git a/.changes/next-release/feature-AmazonElasticsearchService-f30adfb.json b/.changes/next-release/feature-AmazonElasticsearchService-f30adfb.json
new file mode 100644
index 000000000000..a2eb01646bc0
--- /dev/null
+++ b/.changes/next-release/feature-AmazonElasticsearchService-f30adfb.json
@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon Elasticsearch Service",
+    "contributor": "",
+    "description": "Amazon Elasticsearch Service now supports native SAML authentication that seamlessly integrates with the customers' existing SAML 2.0 Identity Provider (IdP)."
+}
diff --git a/services/elasticsearch/src/main/resources/codegen-resources/service-2.json b/services/elasticsearch/src/main/resources/codegen-resources/service-2.json
index 9342cdbd9a9d..522361463a4c 100644
--- a/services/elasticsearch/src/main/resources/codegen-resources/service-2.json
+++ b/services/elasticsearch/src/main/resources/codegen-resources/service-2.json
@@ -732,6 +732,10 @@
         "InternalUserDatabaseEnabled":{
           "shape":"Boolean",
           "documentation":"<p>True if the internal user database is enabled.</p>"
+        },
+        "SAMLOptions":{
+          "shape":"SAMLOptionsOutput",
+          "documentation":"<p>Describes the SAML application configured for a domain.</p>"
         }
       },
       "documentation":"<p>Specifies the advanced security configuration: whether advanced security is enabled, whether the internal database option is enabled.</p>"
@@ -750,6 +754,10 @@
         "MasterUserOptions":{
           "shape":"MasterUserOptions",
           "documentation":"<p>Credentials for the master user: username and password, ARN, or both.</p>"
+        },
+        "SAMLOptions":{
+          "shape":"SAMLOptionsInput",
+          "documentation":"<p>Specifies the SAML application configuration for the domain.</p>"
         }
       },
       "documentation":"<p>Specifies the advanced security configuration: whether advanced security is enabled, whether the internal database option is enabled, master username and password (if internal database is enabled), and master user ARN (if IAM is enabled).</p>"
@@ -804,6 +812,11 @@
       },
       "documentation":"<p> Container for response returned by <code> <a>AssociatePackage</a> </code> operation. </p>"
     },
+    "BackendRole":{
+      "type":"string",
+      "max":256,
+      "min":1
+    },
     "BaseException":{
       "type":"structure",
       "members":{
@@ -3036,6 +3049,94 @@
       "min":3
     },
     "S3Key":{"type":"string"},
+    "SAMLEntityId":{
+      "type":"string",
+      "max":512,
+      "min":8
+    },
+    "SAMLIdp":{
+      "type":"structure",
+      "required":[
+        "MetadataContent",
+        "EntityId"
+      ],
+      "members":{
+        "MetadataContent":{
+          "shape":"SAMLMetadata",
+          "documentation":"<p>The Metadata of the SAML application in xml format.</p>"
+        },
+        "EntityId":{
+          "shape":"SAMLEntityId",
+          "documentation":"<p>The unique Entity ID of the application in SAML Identity Provider.</p>"
+        }
+      },
+      "documentation":"<p>Specifies the SAML Identity Provider's information.</p>"
+    },
+    "SAMLMetadata":{
+      "type":"string",
+      "max":1048576,
+      "min":1
+    },
+    "SAMLOptionsInput":{
+      "type":"structure",
+      "members":{
+        "Enabled":{
+          "shape":"Boolean",
+          "documentation":"<p>True if SAML is enabled.</p>"
+        },
+        "Idp":{
+          "shape":"SAMLIdp",
+          "documentation":"<p>Specifies the SAML Identity Provider's information.</p>"
+        },
+        "MasterUserName":{
+          "shape":"Username",
+          "documentation":"<p>The SAML master username, which is stored in the Amazon Elasticsearch Service domain's internal database.</p>"
+        },
+        "MasterBackendRole":{
+          "shape":"BackendRole",
+          "documentation":"<p>The backend role to which the SAML master user is mapped to.</p>"
+        },
+        "SubjectKey":{
+          "shape":"String",
+          "documentation":"<p>The key to use for matching the SAML Subject attribute.</p>"
+        },
+        "RolesKey":{
+          "shape":"String",
+          "documentation":"<p>The key to use for matching the SAML Roles attribute.</p>"
+        },
+        "SessionTimeoutMinutes":{
+          "shape":"IntegerClass",
+          "documentation":"<p>The duration, in minutes, after which a user session becomes inactive. Acceptable values are between 1 and 1440, and the default value is 60.</p>"
+        }
+      },
+      "documentation":"<p>Specifies the SAML application configuration for the domain.</p>"
+    },
+    "SAMLOptionsOutput":{
+      "type":"structure",
+      "members":{
+        "Enabled":{
+          "shape":"Boolean",
+          "documentation":"<p>True if SAML is enabled.</p>"
+        },
+        "Idp":{
+          "shape":"SAMLIdp",
+          "documentation":"<p>Describes the SAML Identity Provider's information.</p>"
+        },
+        "SubjectKey":{
+          "shape":"String",
+          "documentation":"<p>The key used for matching the SAML Subject attribute.</p>"
+        },
+        "RolesKey":{
+          "shape":"String",
+          "documentation":"<p>The key used for matching the SAML Roles attribute.</p>"
+        },
+        "SessionTimeoutMinutes":{
+          "shape":"IntegerClass",
+          "documentation":"<p>The duration, in minutes, after which a user session becomes inactive.</p>"
+        }
+      },
+      "documentation":"<p>Describes the SAML application configured for the domain.</p>"
+    },
     "ServiceSoftwareOptions":{
       "type":"structure",
       "members":{