Allow client Faraday adapter to be configured via the 'elastic.yml' file

[iobaixas]

Currently only the host and port are configurable. We should add support for more options, like the Faraday adapter (all available options can be seen here: https://github.com/elastic/elasticsearch-ruby/blob/master/elasticsearch-transport/lib/elasticsearch/transport/client.rb).

I propose adding the adapter option to the Configuration class.

[afromankenobi]

Hi! i'm working on this and some test are failing, any idea why?
i'm using ruby 2.2, following your travis spec

Failures:

  1) Elastic::Core::Connector when index already exists and mapping cant be synchronized migrate regenerates index with new map and moves records to new index
     Failure/Error: api.delete_by_query(index: _index, body: { query: { term: { _mark_for_deletion: true } } })

     Elasticsearch::Transport::Transport::Errors::BadRequest:
       [400] No handler found for uri [/elastic_gem_specs_idx_name%3A1508954385/_query] and method [DELETE]
     # /Users/jorgevargas/.rvm/gems/ruby-2.2.6/gems/elasticsearch-transport-1.1.3/lib/elasticsearch/transport/transport/base.rb:201:in `__raise_transport_error'
     # /Users/jorgevargas/.rvm/gems/ruby-2.2.6/gems/elasticsearch-transport-1.1.3/lib/elasticsearch/transport/transport/base.rb:312:in `perform_request'
     # /Users/jorgevargas/.rvm/gems/ruby-2.2.6/gems/elasticsearch-transport-1.1.3/lib/elasticsearch/transport/transport/http/faraday.rb:20:in `perform_request'
     # /Users/jorgevargas/.rvm/gems/ruby-2.2.6/gems/elasticsearch-transport-1.1.3/lib/elasticsearch/transport/client.rb:128:in `perform_request'
     # /Users/jorgevargas/.rvm/gems/ruby-2.2.6/gems/elasticsearch-api-1.1.3/lib/elasticsearch/api/actions/delete_by_query.rb:71:in `delete_by_query'
     # ./lib/elastic/core/connector.rb:216:in `delete_marked_for_deletion'
     # ./lib/elastic/core/connector.rb:128:in `rollover'
     # ./lib/elastic/core/connector.rb:45:in `migrate'
     # ./spec/lib/core/connector_spec.rb:148:in `block (5 levels) in <top (required)>'
     # ./spec/lib/core/connector_spec.rb:148:in `block (4 levels) in <top (required)>'
     # ./spec/support/elasticsearch.rb:22:in `block (2 levels) in <top (required)>'

[blackjid]

Hi!, thanks for looking into this...

Are running the tests against elasticsearch 2.4 or higher?? that might be the problem, try with elasticsarch 1.7.

Also be sure to run the tests with bundle exec rspec spec to be confident you are using the correct version of the elasticsearch gem. That gem is a dependency and the version of the gem has direct relation with the elasticsearch version supported.

[afromankenobi]

Thanks @blackjid, installing elasticsearch 1.4 solves the problem.

[blackjid]

👍 great!, that's the next step, to upgrade our elasticsearch support to the newer versions...

[afromankenobi]

I'll collaborate :)