Used to make raw calls to Elastic Search.

Each function returns a tuple indicating whether or not the request succeeded or failed (:ok or :error), the status code of the response, and then the processed body of the response.

For example, a request like this:

  Elastic.HTTP.get("/answer/_search")

Would return a response like this:

  {:ok, 200,
   %{"_shards" => %{"failed" => 0, "successful" => 5, "total" => 5},
     "hits" => %{"hits" => [%{"_id" => "1", "_index" => "answer", "_score" => 1.0,
          "_source" => %{"text" => "I like using Elastic Search"}, "_type" => "answer"}],
       "max_score" => 1.0, "total" => 1}, "timed_out" => false, "took" => 7}}