Support ap-northeast region for EC2 and S3

Closes #52.

Author: Kenta Suzuki

README.md

@@ -40,7 +40,18 @@ The plugin will automatically use the instance level security credentials (as of
 
 ### Region
 
-The `cloud.aws.region` can be set to a region and will automatically use the relevant settings for both `ec2` and `s3`. The available values are: `us-east` (`us-east-1`), `us-west` (`us-west-1`), `us-west-1`, `us-west-2` `ap-southeast` (`ap-southeast-1`), `ap-southeast-1`, `ap-southeast-2`, `ap-northeast` (`ap-northeast-1`) `eu-west` (`eu-west-1`), `sa-east` (`sa-east-1`).
+The `cloud.aws.region` can be set to a region and will automatically use the relevant settings for both `ec2` and `s3`. The available values are:
+
+* `us-east` (`us-east-1`)
+* `us-west` (`us-west-1`)
+* `us-west-1`
+* `us-west-2`
+* `ap-southeast` (`ap-southeast-1`)
+* `ap-southeast-1`
+* `ap-southeast-2`
+* `ap-northeast` (`ap-northeast-1`)
+* `eu-west` (`eu-west-1`)
+* `sa-east` (`sa-east-1`).
 
 
 ## EC2 Discovery

src/main/java/org/elasticsearch/gateway/s3/S3Gateway.java

@@ -76,6 +76,10 @@ public S3Gateway(Settings settings, ThreadPool threadPool, ClusterService cluste
                     region = "ap-southeast-1";
                 } else if ("ap-southeast-2".equals(regionSetting.toLowerCase())) {
                     region = "ap-southeast-2";
+                } else if ("ap-northeast".equals(regionSetting.toLowerCase())) {
+                    region = "ap-northeast-1";
+                } else if ("ap-northeast-1".equals(regionSetting.toLowerCase())) {
+                    region = "ap-northeast-1";
                 } else if ("eu-west".equals(regionSetting.toLowerCase())) {
                     region = "EU";
                 } else if ("eu-west-1".equals(regionSetting.toLowerCase())) {

src/main/java/org/elasticsearch/repositories/s3/S3Repository.java

@@ -105,6 +105,10 @@ public S3Repository(RepositoryName name, RepositorySettings repositorySettings,
                     region = "ap-southeast-1";
                 } else if ("ap-southeast-2".equals(regionSetting)) {
                     region = "ap-southeast-2";
+                } else if ("ap-northeast".equals(regionSetting)) {
+                    region = "ap-northeast-1";
+                } else if ("ap-northeast-1".equals(regionSetting)) {
+                    region = "ap-northeast-1";
                 } else if ("eu-west".equals(regionSetting)) {
                     region = "EU";
                 } else if ("eu-west-1".equals(regionSetting)) {