Describe the bug

The link on the github homepage to 'User Documentation' is broken.

We should define Elasticsearch::Types for everything that ES6+ supports. See https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-types.html

Bulk API is useful in cases of create or update multiple documents. Current API has some problems with performance in cases of inserting thousands of documents.

Bulk API

In some cases, we have to pre-configure ElasticSearch client or use a shared instance of client, so it would be useful to allow using exiting client in rom-elasticsearch configuration.

So, gateway interface should respect the following interface:

    ROM::Configuration.new(:elasticsearch, client Elasticsearch::Client.new(url))

https://www.elastic.co/guide/en/elasticsearch/reference/current/nested.html

Here is a workaround

schema(:my_index) do
  attribute :authors,
    Types::Object.meta(
      type: 'nested',
      properties: {
        'person_name': { 'type': 'text' }
      }
    )
end

that should be rewritten as following:

schema(:my_index) do
  attribute :authors, Types::Nested do
    attribute :person_name, Types.Text
  end
end