Can not use secure plugins with embedded-elasticsearch

[pacer11]

When installing plugins that require REST Calls with HTTPS vs HTTP the ElasticRestClient.java
class does not accomodate for such functionality.

private String url(String path) {
    return "http://localhost:" + elasticsearchHttpPort + path;

}

It would be ideal if both the protocol and the host could be configurable with a default that way the caller could be provided with the options of choice. The "localhost" reference could probably be replaced with the elasticsearch.yaml's "http.host" value and a custom property could be set to allow for https vs http.

The workaround for me right now is to eliminate using the helper methods to create indices (since these calls use the ElasticRestClient class to perform it's functions) and strictly use the TransportClient Java API.