Bump elasticsearch from 7.11.0 to 7.12.0

Bumps [elasticsearch](https://github.com/elastic/elasticsearch-py) from 7.11.0 to 7.12.0.
- [Release notes](https://github.com/elastic/elasticsearch-py/releases)
- [Changelog](https://github.com/elastic/elasticsearch-py/blob/master/Changelog.rst)
- [Commits](elastic/elasticsearch-py@v7.11.0...v7.12.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -7,7 +7,7 @@ colorama==0.4.4
 cornice==5.1.0
 cornice-swagger==1.0.0
 dockerflow==2020.10.0
-elasticsearch==7.11.0
+elasticsearch==7.12.0
 hupper==1.10.2
 idna==3.1
 iso8601==0.1.14