Bump elasticsearch.version from 6.2.3 to 7.11.2 in /elasticpluginexample
Bump elasticsearch.version from 6.2.3 to 7.11.2 in /elasticpluginexample

Bumps `elasticsearch.version` from 6.2.3 to 7.11.2.

Updates `elasticsearch` from 6.2.3 to 7.11.2
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](https://github.com/elastic/elasticsearch/compare/v6.2.3...v7.11.2)

Updates `framework` from 6.2.3 to 7.11.2
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](https://github.com/elastic/elasticsearch/compare/v6.2.3...v7.11.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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