Added mathing of custom pipeline id

Author: andsel

qa/integration/specs/pipeline_id_log_spec.rb

@@ -31,16 +31,18 @@
   let(:config) { @fixture.config("root") }
 
   it "should write logs to a new dir" do
+    pipeline_name = "custom_pipeline"
     settings = {
       "path.logs" => temp_dir,
+      "pipeline.id" => pipeline_name,
       "slowlog.threshold.warn" => "500ms"
     }
     IO.write(@ls.application_settings_file, settings.to_yaml)
     @ls.spawn_logstash("-w", "1" , "-e", config)
     @ls.wait_for_logstash
     sleep 2 until @ls.exited?
-    pipelinelog_file = "#{temp_dir}/logstash-plain.log"
-    expect(File.exists?(pipelinelog_file)).to be true
-    expect(IO.read(pipelinelog_file).split("\n").size).to be >= 1
+    plainlog_file = "#{temp_dir}/logstash-plain.log"
+    expect(File.exists?(plainlog_file)).to be true
+    expect(IO.read(plainlog_file) =~ /\[logstash.javapipeline\s*\]\[#{pipeline_name}\]/).to be > 0
   end
 end