Gets the file system association information. This operation is only supported for FSx File Gateways.
See https://paws-r.github.io/docs/storagegateway/describe_file_system_associations.html for full documentation.
storagegateway_describe_file_system_associations(FileSystemAssociationARNList)
[required] An array containing the Amazon Resource Name (ARN) of each file system association to be described.