Update ELK images

elasticsearch:
- https://github.com/docker-library/elasticsearch/commit/ade24e9: Pin to 7.14 for now
- https://github.com/docker-library/elasticsearch/commit/9515924: Update to 7.15.0
- https://github.com/docker-library/elasticsearch/commit/12452b4: Update to 6.8.19
- https://github.com/docker-library/elasticsearch/commit/aca03f5: Update to 7.14.2

logstash:
- https://github.com/docker-library/logstash/commit/c77765e: Pin to 7.14 for now
- https://github.com/docker-library/logstash/commit/9242490: Update to 7.15.0
- https://github.com/docker-library/logstash/commit/6f3408c: Update to 6.8.19
- https://github.com/docker-library/logstash/commit/eef3332: Update to 7.14.2

kibana:
- https://github.com/docker-library/kibana/commit/93b1fa0: Pin to 7.14 for now
- https://github.com/docker-library/kibana/commit/8faf2e3: Update to 7.15.0
- https://github.com/docker-library/kibana/commit/5cb47fd: Update to 6.8.19
- https://github.com/docker-library/kibana/commit/d04fefc: Update to 7.14.2

library/elasticsearch

@@ -4,12 +4,12 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/elasticsearch.git
 
-Tags: 7.14.1
+Tags: 7.14.2
 Architectures: amd64, arm64v8
-GitCommit: 54e879a700597725a9bf0bd905e5c3a36daf8404
-Directory: 7
+GitCommit: ade24e9202c209408df15dc88959020313b67773
+Directory: 7.14
 
-Tags: 6.8.18
+Tags: 6.8.19
 Architectures: amd64
-GitCommit: c834683526fe79e051f595e738e26b39a33b22db
+GitCommit: 12452b4a9bdb05e32082ec9ea3d68ac11336df9e
 Directory: 6

library/kibana

@@ -4,12 +4,12 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/kibana.git
 
-Tags: 7.14.1
+Tags: 7.14.2
 Architectures: amd64, arm64v8
-GitCommit: 85653924722cb82ef0ae4e6da4ef7c9f1a8da5e8
-Directory: 7
+GitCommit: 93b1fa087fd940757b530511d868fdc7931149de
+Directory: 7.14
 
-Tags: 6.8.18
+Tags: 6.8.19
 Architectures: amd64
-GitCommit: cff36ad1ea430335a6ceccb4a2f6beaad710551f
+GitCommit: 5cb47fd09dfb83cc484a779cc61ba6abf97f63b2
 Directory: 6

library/logstash

@@ -4,12 +4,12 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/logstash.git
 
-Tags: 7.14.1
+Tags: 7.14.2
 Architectures: amd64, arm64v8
-GitCommit: a17538a2894b156de8868faa847d0577a3c10e5c
-Directory: 7
+GitCommit: c77765eaeb758ec15bc9525a44eff05eecc884aa
+Directory: 7.14
 
-Tags: 6.8.18
+Tags: 6.8.19
 Architectures: amd64
-GitCommit: b33a53e022f25be3395791b247227247642a6504
+GitCommit: 6f3408c8f635558443a440f459211b7e68aeb8e6
 Directory: 6