Update elasticsearch

Changes:

- docker-library/elasticsearch@e86bdc9: Update to 6.8.9
- docker-library/elasticsearch@b8cd81a: Update to 7.7.0
- docker-library/elasticsearch@9aaa5a0: Merge pull request docker-library/elasticsearch#192 from docker-library/github-actions
- docker-library/elasticsearch@548b31c: Add initial GitHub Actions CI

Author: docker-library-bot

library/elasticsearch

@@ -4,10 +4,10 @@ Maintainers: Tianon Gravi <admwiggin@gmail.com> (@tianon),
              Joseph Ferguson <yosifkit@gmail.com> (@yosifkit)
 GitRepo: https://github.com/docker-library/elasticsearch.git
 
-Tags: 7.6.2
-GitCommit: 323a9028774ff18e1e3b1d0304bdd55edc88ab80
+Tags: 7.7.0
+GitCommit: b8cd81aa48870e31970acbca7ec376953810d522
 Directory: 7
 
-Tags: 6.8.8
-GitCommit: 79420fbf8e7f263bc25b4ff7c592240129ecb180
+Tags: 6.8.9
+GitCommit: e86bdc93b04fedbf1e6d0754d1f54324707439ed
 Directory: 6