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Although I don't use OpenSearch, my experience with the persistent defaults so far was that it helped to define explicitly the inputs related to the diffs.  So, if you removed "override_main_response_version" from index.ts, then put it back in as an explicit "override_main_response_version: false".  Your diff might go away, and if not, then try `pulumi refresh` followed by one more `pulumi up`.

<@U03M5L2EMAM> Unfortunately no luck. Tried both the steps. Also I tried to upgrade/downgrade the aws-native version but still same error.

*`aws-native:opensearchservice:Domain (ix-dev_apps_eks_openSearch_cluster):`*
    *`error: operation UPDATE failed with "InvalidRequest": Invalid request provided: Unrecognized advanced option 'override_main_response_version' passed in advancedOptions. (Service: OpenSearch, Status Code: 400, Request ID: 8acf540a-88b3-469a-8cbb-57cf28a7b24a)`*

This looks like some new bug. <https://github.com/hashicorp/terraform-provider-aws/issues/27371>

It was not a bug but I did not see this error after I added "advancedOptions:{}"