Getting a list of regions that support DocumentDB

[AdamBalski]

Describe the bug

List of supported regions for DocumentDB returned by software.amazon.awssdk.regions.servicemetadata.DocdbServiceMetadata#regions does not include eu-south-1, although this service is available in this region.
List of supported regions for DocumentDB returned by DocDbClient.serviceMetadata().regions() returns a superset of regions that document db is supported in as it resolves to RDS regions and some of them do not have support for DocDB.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

I expect both/either of these methods to return the list of all regions that support DocDB.

Current Behavior

List of supported regions for DocDB does not include eu-south-1 region if you get them using: software.amazon.awssdk.regions.servicemetadata.DocdbServiceMetadata#regions.
List of supported regions for DocDB contains regions that have support for RDS, but not for DocDB if you get them using DocDbClient.serviceMetadata().regions().

Reproduction Steps

Call software.amazon.awssdk.regions.servicemetadata.DocdbServiceMetadata#regions method to get list of supported regions for DocDB service.
Call DocDbClient.serviceMetadata().regions() method to get list of supported regions for DocDB service

Possible Solution

No response

Additional Information/Context

This is a follow-up to: #5585

AWS Java SDK version used

2.29.43

JDK version used

openjdk 21.0.5 2024-10-15

Operating System and version

macOS 15.1.1