Bump elasticsearch-dsl from 0.1.8 to 0.1.9 (#13419)

Bump elasticsearch-dsl from 0.1.8 to 0.1.9 (#13419)

Bumps [elasticsearch-dsl](https://github.com/elasticsearch/elasticsearch-ruby) from 0.1.8 to 0.1.9.
- [Release notes](https://github.com/elasticsearch/elasticsearch-ruby/releases)
- [Changelog](https://github.com/elastic/elasticsearch-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elasticsearch/elasticsearch-ruby/compare/v0.1.8...v0.1.9)

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