All of a sudden this morning started getting this error messages in the Logstash logs. Nothing has changed in any of the configs so no idea what's going on..... Any suggestions?
[2018-03-14T13:44:39,467][INFO ][logstash.inputs.udp ] UDP listener started {:address=>"0.0.0.0:5514", :receive_buffer_bytes=>"106496", :queue_size=>"2000"}
[2018-03-14T13:44:39,770][FATAL][logstash.runner ] An unexpected error occurred! {:error=>#<NoMethodError: undefined method <' for nil:NilClass>, :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:213:inget_event_type'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:165:in event_action_params'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:39:inevent_action_tuple'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:34:in block in multi_receive'", "org/jruby/RubyArray.java:2486:inmap'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.0.3-java/lib/logstash/outputs/elasticsearch/common.rb:34:in multi_receive'", "/usr/share/logstash/logstash-core/lib/logstash/output_delegator_strategies/shared.rb:13:inmulti_receive'", "/usr/share/logstash/logstash-core/lib/logstash/output_delegator.rb:49:in multi_receive'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:479:inblock in output_batch'", "org/jruby/RubyHash.java:1343:in each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:478:inoutput_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:430:in worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:385:inblock in start_workers'"]}
[2018-03-14T13:44:39,841][ERROR][org.logstash.Logstash ] java.lang.IllegalStateException: org.jruby.exceptions.RaiseException: (SystemExit) exit
[2018-03-14T13:44:39,842][WARN ][logstash.inputs.udp ] UDP listener died {:exception=>java.nio.channels.ClosedSelectorException, :backtrace=>["sun.nio.ch.SelectorImpl.keys(SelectorImpl.java:68)", "org.jruby.util.io.SelectorPool.put(SelectorPool.java:88)", "org.jruby.util.io.SelectExecutor.selectEnd(SelectExecutor.java:59)", "org.jruby.util.io.SelectExecutor.go(SelectExecutor.java:44)", "org.jruby.RubyIO.select(RubyIO.java:3405)", "org.jruby.RubyIO$INVOKER$s$0$3$select.call(RubyIO$INVOKER$s$0$3$select.gen)", "org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:743)", "org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298)", "org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79)", "org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83)", "org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428)", "org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355)", "org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)", "org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165)", "org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200)", "org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:338)", "org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)", "org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314)", "org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)", "org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165)", "org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200)", "org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:338)", "org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)", "org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314)", "org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)", "org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165)", "org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200)", "org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:338)", "org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)", "org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314)", "org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)", "org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132)", "org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148)", "org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:73)", "org.jruby.runtime.Block.call(Block.java:124)", "org.jruby.RubyProc.call(RubyProc.java:289)", "org.jruby.RubyProc.call(RubyProc.java:246)", "org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:104)", "java.lang.Thread.run(Thread.java:748)"]}