Stop disabling explicit GC

Author: hex2a

spec/defines/005_elasticsearch_instance_spec.rb

@@ -816,7 +816,6 @@ class { 'elasticsearch':
                 -Dlog4j.skipJansi=true.
                 -Dlog4j2.disable.jmx=true.
                 -XX:\+AlwaysPreTouch.
-                -XX:\+DisableExplicitGC.
                 -XX:\+HeapDumpOnOutOfMemoryError.
                 -XX:\+UseCMSInitiatingOccupancyOnly.
                 -XX:\+UseConcMarkSweepGC.