…ration change
AWS demands to pass information about EBS volume during cluster configuration change like e.g. number of data nodes.
Issue: hashicorp#459
Debug data from issue:
```
cluster_config.0.instance_count: "2" => "1"
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: 2017/07/12 12:47:01 [DEBUG] [aws-sdk-go] DEBUG: Request es/UpdateElasticsearchDomainConfig Details:
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: ---[ REQUEST POST-SIGN ]-----------------------------
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: POST /2015-01-01/es/domain/daniel-test/config HTTP/1.1
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: Host: es.us-east-1.amazonaws.com
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: User-Agent: aws-sdk-go/1.10.8 (go1.8.1; linux; amd64) APN/1.0 HashiCorp/1.0 Terraform/0.9.8
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: Content-Length: 150
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: Authorization: AWS4-HMAC-SHA256 Credential=/20170712/us-east-1/es/aws4_request, SignedHeaders=content-length;host;x-amz-date, Signature=
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: X-Amz-Date: 20170712T114701Z
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: Accept-Encoding: gzip
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws:
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: {"ElasticsearchClusterConfig":{"DedicatedMasterEnabled":false,"InstanceCount":2,"InstanceType":"t2.small.elasticsearch","ZoneAwarenessEnabled":false}}
2017/07/12 12:47:01 [DEBUG] plugin: terraform-provider-aws: -----------------------------------------------------
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: 2017/07/12 12:47:02 [DEBUG] [aws-sdk-go] DEBUG: Response es/UpdateElasticsearchDomainConfig Details:
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: ---[ RESPONSE ]--------------------------------------
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: HTTP/1.1 400 Bad Request
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: Content-Length: 188
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: Content-Type: application/json
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: Date: Wed, 12 Jul 2017 11:47:01 GMT
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: X-Amzn-Errortype: ValidationException
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: X-Amzn-Requestid:
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws:
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws:
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: -----------------------------------------------------
2017/07/12 12:47:02 [DEBUG] plugin: terraform-provider-aws: 2017/07/12 12:47:02 [DEBUG] [aws-sdk-go] {"message":"New cluster configuration has insufficient storage capacity for your current data. The new configuration only supports up to 0.0GB. Your current Elasticsearch usage is 0.00GB"}
```
Debug data after fix:
```
cluster_config.0.instance_count: "2" => "1"
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: 2017/07/12 13:42:35 [DEBUG] [aws-sdk-go] DEBUG: Request es/UpdateElasticsearchDomainConfig Details:
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: ---[ REQUEST POST-SIGN ]-----------------------------
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: POST /2015-01-01/es/domain/daniel-test/config HTTP/1.1
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: Host: es.us-east-1.amazonaws.com
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: User-Agent: aws-sdk-go/1.10.8 (go1.8.1; linux; amd64) APN/1.0 HashiCorp/1.0 Terraform/0.9.8
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: Content-Length: 218
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: Authorization: AWS4-HMAC-SHA256 Credential=/20170712/us-east-1/es/aws4_request, SignedHeaders=content-length;host;x-amz-date, Signature=
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: X-Amz-Date: 20170712T124235Z
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: Accept-Encoding: gzip
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws:
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: {"EBSOptions":{"EBSEnabled":true,"VolumeSize":10,"VolumeType":"gp2"},"ElasticsearchClusterConfig":{"DedicatedMasterEnabled":false,"InstanceCount":1,"InstanceType":"t2.small.elasticsearch","ZoneAwarenessEnabled":false}}
2017/07/12 13:42:35 [DEBUG] plugin: terraform-provider-aws: -----------------------------------------------------
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: 2017/07/12 13:42:36 [DEBUG] [aws-sdk-go] DEBUG: Response es/UpdateElasticsearchDomainConfig Details:
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: ---[ RESPONSE ]--------------------------------------
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: HTTP/1.1 200 OK
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: Content-Length: 1355
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: Content-Type: application/json
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: Date: Wed, 12 Jul 2017 12:42:36 GMT
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: X-Amzn-Requestid:
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws:
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws:
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: -----------------------------------------------------
2017/07/12 13:42:36 [DEBUG] plugin: terraform-provider-aws: 2017/07/12 13:42:36 [DEBUG] [aws-sdk-go] {"DomainConfig":{"AccessPo...<CUT>
```
Please verify.
Thanks