provider/aws: Add support for Elastic Search

[radeksimko]

Closes #3381

FYI @nickschuch

Test plan

$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=ElasticSearch' 2>~/tf.log

go generate ./...
TF_ACC=1 go test ./builtin/providers/aws -v -run=ElasticSearch -timeout 90m
=== RUN   TestAccAWSElasticSearchDomain_basic
--- PASS: TestAccAWSElasticSearchDomain_basic (1448.71s)
=== RUN   TestAccAWSElasticSearchDomain_complex
--- PASS: TestAccAWSElasticSearchDomain_complex (1454.23s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    2902.972s

[pmoust]

LGTM! Just tested ;) Thanks for this

[catsby]

Tests pass and the code looks good 👍

[nickschuch]

Thanks @radeksimko! You rock!

(Worked for me!)

[gjohnson]

👍

[ghost]

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