Gemfile in logstash-input-azure_event_hubs-1.4.4 vs Gemfile in logstash-input-azure_event_hubs-1.4.5

@@ -1,9 +1,9 @@
 source 'https://rubygems.org'
 
 gemspec
 
-logstash_path = "../../logstash"
+logstash_path = ENV['LOGSTASH_PATH'] || '../../logstash'
 
 if Dir.exist?(logstash_path) && ENV["LOGSTASH_SOURCE"] == "1"
   gem 'logstash-core', :path => "#{logstash_path}/logstash-core"
   gem 'logstash-core-plugin-api', :path => "#{logstash_path}/logstash-core-plugin-api"
 end