Merge branch 'elastic_indexer' into 'master'

Elastic indexer performance improvements

https://gitlab.com/gitlab-org/gitlab-ee/issues/220

See merge request !140

CHANGELOG-EE

 v 8.5.0 (unreleased)
 
+v 8.4.2
+  - Elasticsearch indexer performance improvements
+
 v 8.4.1
   - No EE-specific changes
 

Gemfile

@@ -94,7 +94,7 @@ gem "seed-fu", '~> 2.3.5'
 # Search
 gem 'elasticsearch-model'
 gem 'elasticsearch-rails'
-gem 'gitlab-elasticsearch-git', require: "elasticsearch/git"
+gem 'gitlab-elasticsearch-git', '~> 0.0.9', require: "elasticsearch/git"
 
 # Markdown and HTML processing
 gem 'html-pipeline', '~> 1.11.0'

Gemfile.lock

@@ -358,13 +358,13 @@ GEM
       mime-types (>= 1.19)
       rugged (>= 0.23.0b)
     github-markup (1.3.3)
-    gitlab-elasticsearch-git (0.0.7)
-      activemodel (~> 4.2.0)
-      activesupport (~> 4.2.0)
-      charlock_holmes (~> 0.7.3)
-      elasticsearch-api (~> 1.0.15)
-      elasticsearch-model
-      github-linguist (~> 4.7.0)
+    gitlab-elasticsearch-git (0.0.9)
+      activemodel (~> 4.2)
+      activesupport (~> 4.2)
+      charlock_holmes (~> 0.7)
+      elasticsearch-api (~> 1.0)
+      elasticsearch-model (~> 0.1.8)
+      github-linguist (~> 4.7)
       rugged (~> 0.23.3)
     gitlab-flowdock-git-hook (1.0.1)
       flowdock (~> 0.7)
@@ -958,7 +958,7 @@ DEPENDENCIES
   gemnasium-gitlab-service (~> 0.2)
   github-linguist (~> 4.7.0)
   github-markup (~> 1.3.1)
-  gitlab-elasticsearch-git
+  gitlab-elasticsearch-git (~> 0.0.9)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-license (~> 0.0.4)
   gitlab_emoji (~> 0.2.0)