Create new rake task with Advanced Search integration details

What does this MR do and why?

This MR adds a new rake task called gitlab:elastic:info that outputs debugging information for the Advanced Search integration.

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Related to #340437 (closed)

ee/lib/tasks/gitlab/elastic.rake

@@ -252,10 +252,10 @@ namespace :gitlab do
       puts "Indexing enabled:\t#{setting.elasticsearch_indexing ? "yes".color(:green) : "no"}"
       puts "Search enabled:\t\t#{setting.elasticsearch_search? ? "yes".color(:green) : "no"}"
       puts "Pause indexing:\t\t#{setting.elasticsearch_pause_indexing? ? "yes".color(:yellow) : "no"}"
-      puts "Max size indexed:\t#{setting.elasticsearch_indexed_file_size_limit_kb} KiB"
+      puts "File size limit:\t#{setting.elasticsearch_indexed_file_size_limit_kb} KiB"
 
       puts ""
-      puts "Indexing Queues Sizes".color(:yellow)
+      puts "Indexing Queues".color(:yellow)
       puts "Initial queue:\t\t#{Elastic::ProcessInitialBookkeepingService.queue_size}"
       puts "Incremental queue:\t#{Elastic::ProcessBookkeepingService.queue_size}"