Bump elasticsearch from 0.90.11 to 6.8.15
Bump elasticsearch from 0.90.11 to 6.8.15

Bumps [elasticsearch](https://github.com/elastic/elasticsearch) from 0.90.11 to 6.8.15.
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](https://github.com/elastic/elasticsearch/compare/v0.90.11...v6.8.15)

---
updated-dependencies:
- dependency-name: org.elasticsearch:elasticsearch
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Tradeshift/elasticsearch-srv-discovery