Merge branch 'rs-elastic-tasks' into 'master'

Add `gitlab:elastic:index` task that rolls up all other index tasks

Also improves consistency of the task descriptions.

See merge request !240

lib/tasks/gitlab/elastic.rake

 namespace :gitlab do
   namespace :elastic do
-    desc "Indexing repositories"
+    desc "GitLab | Update Elasticsearch indexes"
+    task :index do
+      Rake::Task["gitlab:elastic:index_repositories"].invoke
+      Rake::Task["gitlab:elastic:index_wikis"].invoke
+      Rake::Task["gitlab:elastic:index_database"].invoke
+    end
+
+    desc "GitLab | Update Elasticsearch indexes for project repositories"
     task index_repositories: :environment  do
       Repository.__elasticsearch__.create_index!
 
@@ -47,7 +54,7 @@ namespace :gitlab do
       end
     end
 
-    desc "Indexing all wikis"
+    desc "GitLab | Update Elasticsearch indexes for wiki repositories"
     task index_wikis: :environment  do
       ProjectWiki.__elasticsearch__.create_index!
 
@@ -66,7 +73,7 @@ namespace :gitlab do
       end
     end
 
-    desc "Create indexes in the Elasticsearch from database records"
+    desc "GitLab | Update Elasticsearch indexes for all database objects"
     task index_database: :environment do
       [Project, Issue, MergeRequest, Snippet, Note, Milestone].each do |klass|
         klass.__elasticsearch__.create_index!
@@ -79,7 +86,7 @@ namespace :gitlab do
       end
     end
 
-    desc "Create empty indexes"
+    desc "GitLab | Create empty Elasticsearch indexes"
     task create_empty_indexes: :environment do
       [
         Project,
@@ -107,4 +114,4 @@ namespace :gitlab do
       projects
     end
   end
-end
+end
\ No newline at end of file