Updates the requirements on [elasticsearch](https://github.com/elastic/elasticsearch-js) to permit the latest version.
- [Release notes](https://github.com/elastic/elasticsearch-js/releases)
- [Changelog](https://github.com/elastic/elasticsearch-js/blob/master/docs/changelog.asciidoc)
- [Commits](https://github.com/elastic/elasticsearch-js/commits/v15.3.0

)

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