Create elasticsearch_install.rb
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initial Changelog and Readme files
Change port configuration. 9200 Master node/Kibana. 9202 Slaves
Update elasticsearch_install.rb

Modified to allow IAM Roles.
As per: https://github.com/elasticsearch/elasticsearch-cloud-aws
The plugin will default to using IAM Role credentials for authentication. These can be overridden by, in increasing order of precedence, system properties aws.accessKeyId and aws.secretKey, environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_KEY, or the elasticsearch config using cloud.aws.access_key and cloud.aws.secret_key

If no IAM role is used, and access and secret key are not set, the autodiscovery process will fail.
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Merge pull request #3 from hvivani/master

Merging hvivani's ElasticSearch Bootstrap action.