f/ add support for Neptune Serverless

[thomasgouveia]

Description

This PR add the support of AWS Neptune Serverless.

It also add two validation functions for float types : FloatGreaterOrEqualThan and FloatLowerOrEqualThan.

Below is an example Terraform configuration to run a serverless Neptune cluster :

resource "aws_neptune_cluster" "example" {
  cluster_identifier                   = "neptune-cluster-development"
  engine                               = "neptune"

  # The `engine_version` must be set to 1.2.0.1 or above
  engine_version                       = "1.2.0.1"

  # The `neptune_cluster_parameter_group_name` must be a neptune1.2 cluster parameter group.
  neptune_cluster_parameter_group_name = "default.neptune1.2"

  skip_final_snapshot                  = true
  apply_immediately                    = true

  serverless_v2_scaling_configuration {
     min_capacity  = 2.5 # optional
     max_capacity = 128 # optional
  }
}

resource "aws_neptune_cluster_instance" "example" {
  cluster_identifier           = aws_neptune_cluster.example.cluster_identifier
  instance_class               = "db.serverless"
  neptune_parameter_group_name = "default.neptune1.2"
}

To enable Serverless, as AWS documentation explain it, we simply need to provide the new block serverless_v2_scaling_configuration in the aws_neptune_cluster resource.

This block has two attributes with default values :

• min_capacity: default to 2.5
• max_capacity: default to 128

See https://docs.aws.amazon.com/neptune/latest/userguide/neptune-serverless-capacity-scaling.html for more details about those attributes.

Relations

Closes #27622

References

https://docs.aws.amazon.com/neptune/latest/userguide/neptune-serverless-using.html#neptune-conversion-to-serverless
https://docs.aws.amazon.com/neptune/latest/userguide/neptune-serverless-capacity-scaling.html

Output from Acceptance Testing

$ make testacc TESTS=TestAccNeptuneCluster_serverlessConfiguration PKG=neptune

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/neptune/... -v -count 1 -parallel 20 -run='TestAccNeptuneCluster_serverlessConfiguration'  -timeout 180m
=== RUN   TestAccNeptuneCluster_serverlessConfiguration
=== PAUSE TestAccNeptuneCluster_serverlessConfiguration
=== CONT  TestAccNeptuneCluster_serverlessConfiguration
--- PASS: TestAccNeptuneCluster_serverlessConfiguration (181.86s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/neptune    183.604s

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccNeptuneCluster_serverlessConfiguration\|TestAccNeptuneCluster_basic' PKG=neptune ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/neptune/... -v -count 1 -parallel 2  -run=TestAccNeptuneCluster_serverlessConfiguration\|TestAccNeptuneCluster_basic -timeout 180m
=== RUN   TestAccNeptuneCluster_basic
=== PAUSE TestAccNeptuneCluster_basic
=== RUN   TestAccNeptuneCluster_serverlessConfiguration
=== PAUSE TestAccNeptuneCluster_serverlessConfiguration
=== CONT  TestAccNeptuneCluster_basic
=== CONT  TestAccNeptuneCluster_serverlessConfiguration
--- PASS: TestAccNeptuneCluster_serverlessConfiguration (168.81s)
--- PASS: TestAccNeptuneCluster_basic (168.91s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/neptune	176.125s

[ewbankkit]

@thomasgouveia Thanks for the contribution 🎉 👏.

[thomasgouveia]

@ewbankkit you're welcome! :)

[github-actions]

This functionality has been released in v4.40.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.