Thanks and really appreciate your inputs. will try these.  
Would like to ask for more from Indexer and ES perf tuning

ES index buffer sizes, and Queue Sizes and Mem suggestions ?

Logstash - Indexer -- if any Instances setup considerations
flush_size  ?
pool_max  ?
pool_max_per_route  ?
Any conf suggestions ?


NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB