Description

Rebuilding the xDB search index in Azure Search might fail with the October 15th, 2020 Azure Cognitive Search updates. This happens because 2015-02-28-preview and 2015-02-28 Azure Search API versions have been deprecated, and they are no longer supported by Microsoft.

Solution

To resolve the issue, consider one of the following options:

• Upgrade Sitecore XP instance to Sitecore XP 9.0.2 or later, to use a newer API version (2016-09-01 or later) according to the compatibility table (recommended).
• For Sitecore XP 9.0.1, download and install the hotfix: SC Hotfix 232561-2.zip

  Be aware that the hotfix was built for a specific Sitecore XP version and must not be installed on other Sitecore XP versions or in combination with other hotfixes. In case any other hotfixes have already been installed on a certain Sitecore XP instance, send a request for a compatibility check to Sitecore Support.

  Note that the ZIP file contents must be extracted to locate installation instructions and related files inside. The hotfixes must be installed on a CM instance and then synced with other instances using standard development practices.