When creating a DocumentDB cluster in EU(Ireland), you should be able to see the VPC and subnets in that region in the console. If you do not specify a VPC or subnet group when creating a cluster, the console/API will use the default VPC and subnet group in that region (if it has not been explicitly deleted - this is not normal).
Once the cluster has been created in EU(Ireland), you should be able to connect using VPC peering between EU(Ireland) and EU(France).
Connect Amazon DocumentDB Cluster from Outside Amazon VPCasked 10 months ago
VPC peering between Atlas cluster and AWSasked 3 months ago
Can't select subnet at DocumentDBasked 4 years ago
I would like to connect AWS DocumentDB locally to NodeJS.asked 6 months ago
Connection Timeout Issue with DocumentDBAccepted Answerasked 16 days ago
How to configure subnets for an ECS cluster so it can access a database in the same VPC?asked 8 months ago
Connecting Programmatically to Amazon DocumentDBasked 4 months ago
Lambda nodejs cant connect to documentDBasked 23 days ago
"Connect failed" when trying to connect to the DocumentDB cluster from AWS C9asked 9 months ago
Lower pricing options on DocumentDBasked 3 years ago