1.5.2 config

elasticsearch.yml

bootstrap:
  mlockall: true

store:
  index:
    type: mmapfs

network:
  host: _local_

transport:
  ping_timeout: 30s

index:
  codec:
    bloom: 
      load: false 
  merge:
    scheduler:
       type: concurrent
       max_thread_count: 16
    policy:
      max_merged_segment: 1gb
      segments_per_tier: 4
      max_merge_at_once: 4
      max_merge_at_once_explicit: 4
  similarity:
    default:
      type: BM25

indices:
  recovery:
    concurrent_streams: 16
  store:
    throttle:
      type: none
      max_bytes_per_sec: 1gb

gateway:
  type: local
  recover_after_nodes: 3
  recover_after_time: 15m
  expected_nodes: 3

threadpool:
  merge:
    type: fixed
    size: 16
    queue_size: 64
  bulk:
    type: fixed
    size: 64
    queue_size: 64

discovery:
  zen:
    ping_timeout: 5s
    minimum_master_nodes: 2

script:
   disable_dynamic: true
   groovy:
      sandbox.enabled: false