[Release] Update index.json for extension [ datamigration-1.0.0b4 ]

Triggered by Azure CLI Extensions Release Pipeline - ADO_BUILD_URL: https://dev.azure.com/msazure/One/_build/results?buildId=116856022&view=results

Last commit: Azure@21ca379

Author: azclibot

src/index.json

@@ -47189,6 +47189,49 @@
                     "version": "1.0.0b3"
                 },
                 "sha256Digest": "a4e6df2da4bca506455e0508f1ea6f613863529723c1681f2d6682b356584e0c"
+            },
+            {
+                "downloadUrl": "https://azcliprod.blob.core.windows.net/cli-extensions/datamigration-1.0.0b4-py3-none-any.whl",
+                "filename": "datamigration-1.0.0b4-py3-none-any.whl",
+                "metadata": {
+                    "azext.isPreview": true,
+                    "azext.minCliCoreVersion": "2.15.0",
+                    "classifiers": [
+                        "Development Status :: 4 - Beta",
+                        "Intended Audience :: Developers",
+                        "Intended Audience :: System Administrators",
+                        "Programming Language :: Python",
+                        "Programming Language :: Python :: 3",
+                        "Programming Language :: Python :: 3.6",
+                        "Programming Language :: Python :: 3.7",
+                        "Programming Language :: Python :: 3.8",
+                        "License :: OSI Approved :: MIT License"
+                    ],
+                    "extensions": {
+                        "python.details": {
+                            "contacts": [
+                                {
+                                    "email": "[email protected]",
+                                    "name": "Microsoft Corporation",
+                                    "role": "author"
+                                }
+                            ],
+                            "document_names": {
+                                "description": "DESCRIPTION.rst"
+                            },
+                            "project_urls": {
+                                "Home": "https://github.com/Azure/azure-cli-extensions/tree/master/src/datamigration"
+                            }
+                        }
+                    },
+                    "generator": "bdist_wheel (0.30.0)",
+                    "license": "MIT",
+                    "metadata_version": "2.0",
+                    "name": "datamigration",
+                    "summary": "Microsoft Azure Command-Line Tools DataMigrationManagementClient Extension",
+                    "version": "1.0.0b4"
+                },
+                "sha256Digest": "3ae99fcb1ee3b3c07c340812be133f103fa5b718eb0b289cc75e03eff532f863"
             }
         ],
         "dataprotection": [