elastic_repo_indexer does not follow configuration options

• https://gitlab.com/gitlab-org/gitlab-ee/blob/master/bin/elastic_repo_indexer#L17

  This part should be changed to, because the json passed to the subprocess doesn't use symbols:

   ELASTIC_HOST = elastic_connection_info['host']
   ELASTIC_PORT = elastic_connection_info['port']

• https://gitlab.com/gitlab-org/gitlab-elasticsearch-git/blob/master/lib/elasticsearch/git/repository.rb#L350

  This should be changed to include host: ELASTIC_HOST, port: ELASTIC_PORT.

  Dirty hack for this:

   ENV['ELASTICSEARCH_URL'] = "#{ELASTIC_HOST.first}:#{ELASTIC_PORT}"