added install instruction with apt
added install instruction with apt

Closes #6206

vorce/es-metrics,aparo/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,fubuki/elasticsearch,vorce/es-metrics,vorce/es-metrics,fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,aparo/elasticsearch