[CI] Print out Elasticsearch container info

Author: picandocodigo

rake_tasks/elasticsearch_tasks.rake

@@ -197,11 +197,13 @@ namespace :elasticsearch do
     end
 
     es_version_info = admin_client.info['version']
-    unless build_hash = es_version_info['build_hash']
-      STDERR.puts "[!] Cannot determine checkout build hash -- server not running"
+    unless (build_hash = es_version_info['build_hash'])
+      $stderr.puts "[!] Cannot determine checkout build hash -- server not running"
       exit(1)
     end
 
+    $stdout.puts "ELASTICSEARCH INFO: #{es_version_info}"
+
     name = ENV['CI'] ? build_hash : "[\e[1m#{build_hash}\e[0m]"
     STDERR.puts '-'*80, "YAML tests: Switching to #{name} from #{current_branch}", '-'*80
     git_specs("checkout #{build_hash} --force --quiet")