access_key_id is deprecated

[mariusgrigaitis]

DEPRECATION WARNING: called deprecated method `access_key_id' of an Aws::CredentialProvider, use #credentials instead
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-aws-elasticsearch-service-0.1.6/lib/fluent/plugin/out_aws-elasticsearch-service.rb:88:in `inspect'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:207:in `inspect'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:207:in `inspect'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:207:in `block in connection_options_description'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:204:in `map'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:204:in `connection_options_description'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:165:in `client'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:353:in `send_bulk'
/home/fluent/.gem/ruby/2.3.0/gems/fluent-plugin-elasticsearch-1.9.2/lib/fluent/plugin/out_elasticsearch.rb:339:in `write_objects'
/usr/lib/ruby/gems/2.3.0/gems/fluentd-0.14.12/lib/fluent/compat/output.rb:521:in `write'
/usr/lib/ruby/gems/2.3.0/gems/fluentd-0.14.12/lib/fluent/compat/output.rb:128:in `write'
/usr/lib/ruby/gems/2.3.0/gems/fluentd-0.14.12/lib/fluent/plugin/output.rb:1018:in `try_flush'
/usr/lib/ruby/gems/2.3.0/gems/fluentd-0.14.12/lib/fluent/plugin/output.rb:1243:in `flush_thread_run'
/usr/lib/ruby/gems/2.3.0/gems/fluentd-0.14.12/lib/fluent/plugin/output.rb:401:in `block (2 levels) in start'
/usr/lib/ruby/gems/2.3.0/gems/fluentd-0.14.12/lib/fluent/plugin_helper/thread.rb:78:in `block in thread_create'