Bump elasticsearch from 7.8.0 to 7.8.1 (#9591)

* Bump elasticsearch from 7.8.0 to 7.8.1

Bumps [elasticsearch](https://github.com/elastic/elasticsearch-ruby) from 7.8.0 to 7.8.1.
- [Release notes](https://github.com/elastic/elasticsearch-ruby/releases)
- [Changelog](https://github.com/elastic/elasticsearch-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elastic/elasticsearch-ruby/compare/v7.8.0...v7.8.1)

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

* Bump elasticsearch from 7.8.0 to 7.8.1 (Update vendor/cache)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -252,12 +252,12 @@ GEM
       unf (>= 0.0.5, < 1.0.0)
     doorkeeper (5.4.0)
       railties (>= 5)
-    elasticsearch (7.8.0)
-      elasticsearch-api (= 7.8.0)
-      elasticsearch-transport (= 7.8.0)
-    elasticsearch-api (7.8.0)
+    elasticsearch (7.8.1)
+      elasticsearch-api (= 7.8.1)
+      elasticsearch-transport (= 7.8.1)
+    elasticsearch-api (7.8.1)
       multi_json
-    elasticsearch-transport (7.8.0)
+    elasticsearch-transport (7.8.1)
       faraday (~> 1)
       multi_json
     em-websocket (0.5.1)
@@ -475,7 +475,7 @@ GEM
     momentjs-rails (2.20.1)
       railties (>= 3.1)
     msgpack (1.3.3)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
     nakayoshi_fork (0.0.4)