Cannot upgrade OpenSearch service for unknown reason

Question

I have two OpenSearch Service deployed in AWS, one for PreProduction and the other one for production purpose.
I have just received an AWS notification telling me both of my services have an update release (R20211203).

The update release is available only onto 1 of my 2 services.

The AWS portal is showing the following message "Your domain is not eligible to be updated. Please see [Learn more](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/service-software.html) for more information."

The "Learn more" documentation shows reasons why my domain might be ineligible for a service software update but none of the reasons seems to apply to my domain as both are pretty in the same state while i can upgrade one.

Any clues?

Accepted Answer

I checked back my domain today and no more "Not eligible domain" message. I was able to launch the service update.
Can't explain why few days ago my domain was not eligible. Time resolved this issue.

Answer

I've run into a similar issue, I was able to apply the service patch on couple of my domains but a couple of them give the same error as mentioned above
> "Your domain is not eligible to be updated. Please see Learn more for more information."

The learn more link does mention that  "Issues with OpenSearch Service itself might cause your domain to display as ineligible for an update."
I'm hoping that's the case nothing else fits my situation.

Cannot upgrade OpenSearch service for unknown reason

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