Elasticsearch v-1.5 showing high CPU & memory utilization

We've recently started using elasticsearch(V-1.5) on one of our app &
started facing following issues..

  • Generating Logs ( Exceptionally very high viz.. 5 min 5GB log )

  • High CPU Utilization

  • In-spite of deleting logs, disk space was not released. Needed Hard
    boot the server to release the logs space.

System Configuration

OS - Linux 14.04 LTS 64bit Ubuntu.

vCPU - 2 Core

vRAM - 8 GB

Disk Space - 100 GB

Don't know what's going wrong. Any clue...

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