ElasticSearch error "socket hang up"

Elasticsearch ERROR: 2017-04-21T02:09:59Z
  Error: Request error, retrying
  POST https://7e97d2d6bcb5e2351446637a2f6f6993.ap-northeast-1.aws.found.io:9243/_search?type=delivery&size=1000 => socket hang up
      at Log.error (/var/app/current/node_modules/elasticsearch/src/lib/log.js:225:56)
      at checkRespForFailure (/var/app/current/node_modules/elasticsearch/src/lib/transport.js:240:18)
      at HttpConnector.<anonymous> (/var/app/current/node_modules/elasticsearch/src/lib/connectors/http.js:162:7)
      at ClientRequest.wrapper (/var/app/current/node_modules/elasticsearch/node_modules/lodash/index.js:3095:19)
      at emitOne (events.js:96:13)
      at ClientRequest.emit (events.js:188:7)
      at TLSSocket.socketOnEnd (_http_client.js:346:9)
      at emitNone (events.js:91:20)
      at TLSSocket.emit (events.js:185:7)
      at endReadableNT (_stream_readable.js:974:12)
      at _combinedTickCallback (internal/process/next_tick.js:74:11)
      at process._tickDomainCallback (internal/process/next_tick.js:122:9)

I seeing this error.
what's happened?

thank you for your help

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