Too many requests will result in intermittent errors.
[2017-09-28T22:51:02,535][ERROR][logstash.inputs.http ] unable to process event. {:request=>{"request_method"=>"POST", "request_path"=>"/", "request_uri"=>"/", "http_version"=>"HTTP/1.1", "http_accept"=>"text/plain, application/json, application/*+json, */*", "content_type"=>"application/x-ndjson;charset=UTF-8", "http_accept_charset"=>"***", "content_length"=>"533", "http_host"=>x.x.x.x:28080", "http_connection"=>"Keep-Alive", "http_user_agent"=>"Apache-HttpClient/4.5.2 (Java/1.8.0_101)", "http_accept_encoding"=>"gzip,deflate", "http_pinpoint_traceid"=>"xxx.yyy^1506582527015^6136", "http_pinpoint_spanid"=>"-590602330179949913", "http_pinpoint_pspanid"=>"-6428203132369051042", "http_pinpoint_flags"=>"0", "http_pinpoint_pappname"=>"xxxx", "http_pinpoint_papptype"=>"1010", "http_pinpoint_host"=>"x.x.x.x:28080"}, :message=>"undefined method `[]=' for 1300:Fixnum", :class=>"NoMethodError", :backtrace=>["/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/logstash-codec-es_bulk-3.0.3/lib/logstash/codecs/es_bulk.rb:36:in `decode'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/logstash-codec-line-3.0.2/lib/logstash/codecs/line.rb:39:in `decode'", "org/jruby/RubyArray.java:1613:in `each'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/logstash-codec-line-3.0.2/lib/logstash/codecs/line.rb:38:in `decode'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/logstash-codec-es_bulk-3.0.3/lib/logstash/codecs/es_bulk.rb:25:in `decode'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/logstash-input-http-3.0.4/lib/logstash/inputs/http.rb:140:in `run'", "org/jruby/RubyProc.java:281:in `call'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/logstash-input-http-3.0.4/lib/logstash/util/http_compressed_requests.rb:27:in `call'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/rack-1.6.8/lib/rack/builder.rb:153:in `call'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:557:in `handle_request'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:555:in `handle_request'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:404:in `process_client'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:400:in `process_client'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:270:in `run'", "org/jruby/RubyProc.java:281:in `call'", "/xxx/xxx/logstash-5.4.3_l4_logging/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/thread_pool.rb:106:in `spawn_thread'"]}
or
[2017-09-29T12:05:19,271][ERROR][logstash.inputs.http ] unable to process event. {:request=>{"request_method"=>"POST", "request_path"=>"/", "request_uri"=>"/", "http_version"=>"HTTP/1.1", "http_accept"=>"text/plain, application/json, application/*+json, */*", "content_type"=>"application/x-ndjson;charset=UTF-8", "http_accept_charset"=>"***", "content_length"=>"379", "http_host"=>"x.x.x.x:28080", "http_connection"=>"Keep-Alive", "http_user_agent"=>"Apache-HttpClient/4.5.2 (Java/1.8.0_101)", "http_accept_encoding"=>"gzip,deflate", "http_pinpoint_traceid"=>"xxxx.xxx^1506579140846^125648", "http_pinpoint_spanid"=>"-5495314904566667604", "http_pinpoint_pspanid"=>"-6202184905719084245", "http_pinpoint_flags"=>"0", "http_pinpoint_pappname"=>"xxxx", "http_pinpoint_papptype"=>"1010", "http_pinpoint_host"=>"x.x.x.x:28080"}, :message=>"string not matched", :class=>"IndexError", :backtrace=>["org/jruby/RubyString.java:3910:in `[]='", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/logstash-codec-es_bulk-3.0.3/lib/logstash/codecs/es_bulk.rb:36:in `decode'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/logstash-codec-line-3.0.2/lib/logstash/codecs/line.rb:39:in `decode'", "org/jruby/RubyArray.java:1613:in `each'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/logstash-codec-line-3.0.2/lib/logstash/codecs/line.rb:38:in `decode'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/logstash-codec-es_bulk-3.0.3/lib/logstash/codecs/es_bulk.rb:25:in `decode'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-http-3.0.4/lib/logstash/inputs/http.rb:140:in `run'", "org/jruby/RubyProc.java:281:in `call'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-http-3.0.4/lib/logstash/util/http_compressed_requests.rb:27:in `call'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/rack-1.6.8/lib/rack/builder.rb:153:in `call'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:557:in `handle_request'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:555:in `handle_request'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:404:in `process_client'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:400:in `process_client'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:270:in `run'", "org/jruby/RubyProc.java:281:in `call'", "/xxx/xxx/logstash/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/thread_pool.rb:106:in `spawn_thread'"]}
or
and so on.
There's a sudden spike in demand, so there's a way to deal with it.