@NitinB17212478 please could you have a look at a recently-published support document:

Search fails in data class in Search and Reporting Service

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The error you are encountering, which indicates a 403 Forbidden status, suggests that there may be an authentication issue or insufficient permissions related to the SRS (Search and Reporting Service) when attempting to purge previously indexed instances. Here are some steps you can take to resolve this issue:

1. Check Permissions: Ensure that the user account you are using has the necessary permissions to perform purging operations on the SRS.
2. Review Logs: Check the logs for both Infinity and SRS to identify the specific reason for the 403 response. This may provide more context on what is being blocked.
3. Dynamic System Settings: Consider applying additional settings using available dynamic system settings to manage indexing and purging operations effectively.
4. Contact Support: If the issue persists, it may be beneficial to reach out to Pega support for further assistance, as they can provide more tailored guidance based on your specific environment and configuration.

Reindexing errors