Fixes deprecated File.exists?

Author: picandocodigo

elasticsearch-api/Rakefile

@@ -65,7 +65,7 @@ namespace :test do
     filename = 'tmp/artifacts.json'
     `curl -s https://artifacts-api.elastic.co/v1/versions/#{version_number} -o #{filename}`
 
-    unless File.exists?("./#{filename}")
+    unless File.exist?("./#{filename}")
       STDERR.puts '[!] Couldn\'t download artifacts file'
       exit 1
     end
@@ -82,7 +82,7 @@ namespace :test do
     puts 'Downloading zip file:'
     `curl -s #{zip_url} -o tmp/#{filename}`
 
-    unless File.exists?("./tmp/#{filename}")
+    unless File.exist?("./tmp/#{filename}")
       STDERR.puts '[!] Couldn\'t download artifact'
       exit 1
     end

profile/benchmarking/benchmarking_tasks.rake

@@ -164,7 +164,7 @@ namespace :benchmark do
     task :download_dataset do
       current_path = File.expand_path(File.dirname(__FILE__))
       data_path = [current_path, 'data'].join('/')
-      unless File.exists?([data_path, 'stackoverflow.json'].join('/'))
+      unless File.exist?([data_path, 'stackoverflow.json'].join('/'))
         `gsutil cp gs://clients-team-files/stackoverflow.json "#{data_path}/"`
       end
     end

rake_tasks/elasticsearch_tasks.rake

@@ -80,7 +80,7 @@ namespace :elasticsearch do
     end
     puts "Successfully downloaded #{filename}"
 
-    unless File.exists?(filename)
+    unless File.exist?(filename)
       STDERR.puts "[!] Couldn't download #{filename}"
       exit 1
     end