2019-05-10 15:38:27 +0900 [warn]: #0 [...] failed to flush the buffer. retry_time=0 next_retry_seconds=2019-05-10 15:38:12 +0900 chunk="58882d06509e33d5aeb3ed48dff56386" error_class=ThreadError error="deadlock; recursive locking"
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/connections/connection.rb:133:in `synchronize'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/connections/connection.rb:133:in `resurrectable?'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/connections/connection.rb:125:in `resurrect!'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/base.rb:112:in `block in resurrect_dead_connections!'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/base.rb:112:in `each'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/base.rb:112:in `resurrect_dead_connections!'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/base.rb:87:in `get_connection'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/base.rb:271:in `perform_request'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/transport/http/faraday.rb:37:in `perform_request'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-transport-7.0.0/lib/elasticsearch/transport/client.rb:160:in `perform_request'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/elasticsearch-api-7.0.0/lib/elasticsearch/api/actions/bulk.rb:101:in `bulk'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluent-plugin-elasticsearch-2.11.10/lib/fluent/plugin/out_elasticsearch.rb:621:in `send_bulk'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluent-plugin-elasticsearch-2.11.10/lib/fluent/plugin/out_elasticsearch.rb:523:in `block in write'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluent-plugin-elasticsearch-2.11.10/lib/fluent/plugin/out_elasticsearch.rb:522:in `each'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluent-plugin-elasticsearch-2.11.10/lib/fluent/plugin/out_elasticsearch.rb:522:in `write'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluentd-1.2.5/lib/fluent/plugin/output.rb:1110:in `try_flush'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluentd-1.2.5/lib/fluent/plugin/output.rb:1389:in `flush_thread_run'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluentd-1.2.5/lib/fluent/plugin/output.rb:444:in `block (2 levels) in start'
  2019-05-10 15:38:27 +0900 [warn]: #0 /path/to/vendor/bundle/ruby/2.6.0/gems/fluentd-1.2.5/lib/fluent/plugin_helper/thread.rb:78:in `block in thread_create'

GEM
  remote: https://rubygems.org/
  specs:
    cool.io (1.5.4)
    dig_rb (1.0.1)
    elasticsearch (7.0.0)
      elasticsearch-api (= 7.0.0)
      elasticsearch-transport (= 7.0.0)
    elasticsearch-api (7.0.0)
      multi_json
    elasticsearch-transport (7.0.0)
      faraday
      multi_json
    ethon (0.12.0)
      ffi (>= 1.3.0)
    excon (0.64.0)
    faraday (0.15.4)
      multipart-post (>= 1.2, < 3)
    ffi (1.10.0)
    fluent-plugin-elasticsearch (2.11.10)
      elasticsearch
      excon
      fluentd (>= 0.14.20)
    fluent-plugin-ping-message (1.0.0)
      fluentd (>= 0.14.0)
    fluent-plugin-prometheus (1.0.1)
      fluentd (>= 0.14.8, < 2)
      prometheus-client
    fluent-plugin-record-reformer (0.9.1)
      fluentd
    fluent-plugin-suppress (1.0.0)
      fluentd (>= 0.14.8, < 2)
    fluentd (1.2.5)
      cool.io (>= 1.4.5, < 2.0.0)
      dig_rb (~> 1.0.0)
      http_parser.rb (>= 0.5.1, < 0.7.0)
      msgpack (>= 0.7.0, < 2.0.0)
      serverengine (>= 2.0.4, < 3.0.0)
      sigdump (~> 0.2.2)
      strptime (>= 0.2.2, < 1.0.0)
      tzinfo (~> 1.0)
      tzinfo-data (~> 1.0)
      yajl-ruby (~> 1.0)
    http_parser.rb (0.6.0)
    msgpack (1.2.10)
    multi_json (1.13.1)
    multipart-post (2.1.0)
    oj (3.6.7)
    prometheus-client (0.9.0)
      quantile (~> 0.2.1)
    quantile (0.2.1)
    serverengine (2.1.1)
      sigdump (~> 0.2.2)
    sigdump (0.2.4)
    strptime (0.2.3)
    thread_safe (0.3.6)
    typhoeus (1.3.0)
      ethon (>= 0.9.0)
    tzinfo (1.2.5)
      thread_safe (~> 0.1)
    tzinfo-data (1.2019.1)
      tzinfo (>= 1.0.0)
    yajl-ruby (1.4.1)

PLATFORMS
  ruby

DEPENDENCIES
  fluent-plugin-elasticsearch (= 2.11.10)
  fluent-plugin-ping-message (= 1.0.0)
  fluent-plugin-prometheus (= 1.0.1)
  fluent-plugin-record-reformer (= 0.9.1)
  fluent-plugin-suppress (= 1.0.0)
  fluentd (= 1.2.5)
  oj (= 3.6.7)
  typhoeus (= 1.3.0)

BUNDLED WITH
   1.17.2