def deps do
  [
    {:elasticsearch, "~> 1.0.0"}
  ]
end

defmodule MyApp.ElasticsearchCluster do
  use Elasticsearch.Cluster, otp_app: :my_app
end

children = [
  MyApp.ElasticsearchCluster
]

Elasticsearch.get(MyApp.ElasticsearchCluster, "/_cat/health")

config :my_app, MyApp.ElasticsearchCluster,
  # The URL where Elasticsearch is hosted on your system
  url: "http://localhost:9200",

  # If your Elasticsearch cluster uses HTTP basic authentication,
  # specify the username and password here:
  username: "username",
  password: "password",

  # If you want to mock the responses of the Elasticsearch JSON API
  # for testing or other purposes, you can inject a different module
  # here. It must implement the Elasticsearch.API behaviour.
  api: Elasticsearch.API.HTTP,

  # Customize the library used for JSON encoding/decoding.
  json_library: Poison, # or Jason

  # You should configure each index which you maintain in Elasticsearch here.
  # This configuration will be read by the `mix elasticsearch.build` task,
  # described below.
  indexes: %{
    # This is the base name of the Elasticsearch index. Each index will be
    # built with a timestamp included in the name, like "posts-5902341238".
    # It will then be aliased to "posts" for easy querying.
    posts: %{
      # This file describes the mappings and settings for your index. It will
      # be posted as-is to Elasticsearch when you create your index, and
      # therefore allows all the settings you could post directly.
      settings: "priv/elasticsearch/posts.json",

      # This store module must implement a store behaviour. It will be used to
      # fetch data for each source in each indexes' `sources` list, below:
      store: MyApp.ElasticsearchStore,

      # This is the list of data sources that should be used to populate this
      # index. The `:store` module above will be passed each one of these
      # sources for fetching.
      #
      # Each piece of data that is returned by the store must implement the
      # Elasticsearch.Document protocol.
      sources: [MyApp.Post],

      # When indexing data using the `mix elasticsearch.build` task,
      # control the data ingestion rate by raising or lowering the number
      # of items to send in each bulk request.
      bulk_page_size: 5000,

      # Likewise, wait a given period between posting pages to give
      # Elasticsearch time to catch up.
      bulk_wait_interval: 15_000, # 15 seconds

      # By default bulk indexing uses the "create" action. To allow existing
      # documents to be replaced, use the "index" action instead.
      bulk_action: "create"
    }
  }

config :my_app, MyApp.ElasticsearchCluster,
  default_options: [
    timeout: 5_000,
    recv_timeout: 5_000,
    hackney: [pool: :pool_name]
  ]

defmodule MyApp.ElasticsearchStore do
  @behaviour Elasticsearch.Store

  import Ecto.Query

  alias MyApp.Repo

  @impl true
  def stream(schema) do
    Repo.stream(schema)
  end

  @impl true
  def transaction(fun) do
    {:ok, result} = Repo.transaction(fun, timeout: :infinity)
    result
  end
end

defimpl Elasticsearch.Document, for: MyApp.Post do
  def id(post), do: post.id
  def routing(_), do: false
  def encode(post) do
    %{
      title: post.title,
      author: post.author
    }
  end
end

# config/test.exs
config :my_app, MyApp.ElasticsearchCluster,
  api: MyApp.ElasticsearchMock

defmodule MyApp.ElasticsearchMock do
  @behaviour Elasticsearch.API

  @impl true
  def request(_config, :get, "/posts/1", _data, _opts) do
    {:ok, %HTTPoison.Response{
      status_code: 404,
      body: %{
        "status" => "not_found"
      }
    }}
  end
end

# Add to deps 
def deps do
  [          
    # ...
    {:sigaws, ">= 0.0.0"}
  ]
end

# config/prod.exs
config :my_app, MyApp.ElasticsearchCluster,
  api: Elasticsearch.API.AWS,
  default_options: [
    aws: [
      region: "us-east-1",
      service: "es",
      access_key: "aws_access_key_id",
      secret: "aws_secret_access_key"
    ]
  ]

# MyApp.Post must implement Elasticsearch.Document
Elasticsearch.put_document(MyApp.ElasticsearchCluster, %MyApp.Post{}, "index-name")

Elasticsearch.delete_document(MyApp.ElasticsearchCluster, %MyApp.Post{}, "index-name")

# Raw query
Elasticsearch.post(MyApp.ElasticsearchCluster, "/posts/_doc/_search", '{"query": {"match_all": {}}}')

# Using a map
Elasticsearch.post(MyApp.ElasticsearchCluster, "/posts/_doc/_search", %{"query" => %{"match_all" => %{}}})