r/aws_cloudsearch_domain: fix index_field crash on read

[jar-b]

Description

A missing nil check in the flattener for the index_field argument could, under certain conditions, cause the read operation to panic.

Relations

Closes #35884

References

Output from Acceptance Testing

% make testacc PKG=cloudsearch TESTS=TestAccCloudSearchDomain_
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudsearch/... -v -count 1 -parallel 20 -run='TestAccCloudSearchDomain_'  -timeout 360m

--- PASS: TestAccCloudSearchDomain_basic (708.55s)
--- PASS: TestAccCloudSearchDomain_disappears (746.41s)
--- PASS: TestAccCloudSearchDomain_sourceFields (1712.89s)
--- PASS: TestAccCloudSearchDomain_indexFields (1859.65s)
--- PASS: TestAccCloudSearchDomain_update (2328.91s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/cloudsearch        2336.129s

[github-actions]

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[ewbankkit]

LGTM 🚀.

[i-ate-a-vm]

Thanks for getting this fixed so quickly!

[github-actions]

This functionality has been released in v5.38.0 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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