This issue covers the work needed to fully enable blocking direct internal system index access via the REST API. This work depends on at least the following:

• System index deletion API Add an API to remove System Indices #62778
• Tests stop directly accessing system indices Stop accessing System Indices directly in REST tests #62501
• External system indices External system indices #67383
• Enable Enrich to work with System Indices Allow population of Enrich indices to work with System Index protections #62505