java.io.IOException: Page file size is too small to hold elements

I am getting the below message on 7.2.0 logstash. I use the same pipeline i had for 6.x but with 7.2.0 i get the below error. Any ideas?

root@d-gp2-es46-4:/var/log/logstash# cat logstash-plain.log
[2019-07-30T22:48:17,235][INFO ][logstash.runner ] Starting Logstash {"logstash.version"=>"7.2.0"}
[2019-07-30T22:48:19,133][INFO ][logstash.monitoring.internalpipelinesource] Monitoring License OK
[2019-07-30T22:48:19,136][INFO ][logstash.monitoring.internalpipelinesource] Validated license for monitoring. Enabling monitoring pipeline.
[2019-07-30T22:48:23,821][ERROR][org.logstash.execution.AbstractPipelineExt] Logstash failed to create queue.
java.io.IOException: Page file size is too small to hold elements
at org.logstash.ackedqueue.io.MmapPageIOV2.mapFile(MmapPageIOV2.java:275) ~[logstash-core.jar:?]
at org.logstash.ackedqueue.io.MmapPageIOV2.open(MmapPageIOV2.java:64) ~[logstash-core.jar:?]
at org.logstash.ackedqueue.Queue.open(Queue.java:193) ~[logstash-core.jar:?]
at org.logstash.ackedqueue.ext.JRubyAckedQueueExt.open(JRubyAckedQueueExt.java:101) ~[logstash-core.jar:?]
at org.logstash.ackedqueue.ext.JRubyWrappedAckedQueueExt.initialize(JRubyWrappedAckedQueueExt.java:42) ~[logstash-core.jar:?]
at org.logstash.ackedqueue.QueueFactoryExt.create(QueueFactoryExt.java:39) ~[logstash-core.jar:?]
at org.logstash.execution.AbstractPipelineExt.openQueue(AbstractPipelineExt.java:169) [logstash-core.jar:?]
at org.logstash.execution.AbstractPipelineExt$INVOKER$i$0$0$openQueue.call(AbstractPipelineExt$INVOKER$i$0$0$openQueue.gen) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:831) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.ir.targets.InvokeSite.invoke(InvokeSite.java:183) [jruby-complete-9.2.7.0.jar:?]
at usr.share.logstash.logstash_minus_core.lib.logstash.java_pipeline.RUBY$method$initialize$0(/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:25) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.internal.runtime.methods.CompiledIRMethod.call(CompiledIRMethod.java:91) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:90) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:296) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:82) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.RubyClass.newInstance(RubyClass.java:915) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.RubyClass$INVOKER$i$newInstance.call(RubyClass$INVOKER$i$newInstance.gen) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.ir.targets.InvokeSite.invoke(InvokeSite.java:183) [jruby-complete-9.2.7.0.jar:?]
at usr.share.logstash.logstash_minus_core.lib.logstash.pipeline_action.create.RUBY$method$execute$0(/usr/share/logstash/logstash-core/lib/logstash/pipeline_action/create.rb:36) [jruby-complete-9.2.7.0.jar:?]
at usr.share.logstash.logstash_minus_core.lib.logstash.pipeline_action.create.RUBY$method$execute$0$VARARGS(/usr/share/logstash/logstash-core/lib/logstash/pipeline_action/create.rb) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.internal.runtime.methods.CompiledIRMethod.call(CompiledIRMethod.java:91) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:90) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.ir.targets.InvokeSite.invoke(InvokeSite.java:183) [jruby-complete-9.2.7.0.jar:?]
at usr.share.logstash.logstash_minus_core.lib.logstash.agent.RUBY$block$converge_state$2(/usr/share/logstash/logstash-core/lib/logstash/agent.rb:325) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.runtime.CompiledIRBlockBody.callDirect(CompiledIRBlockBody.java:136) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:77) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.runtime.Block.call(Block.java:124) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.RubyProc.call(RubyProc.java:295) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.RubyProc.call(RubyProc.java:274) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.RubyProc.call(RubyProc.java:270) [jruby-complete-9.2.7.0.jar:?]
at org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:105) [jruby-complete-9.2.7.0.jar:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]

here is the full error stack ...

https://justpaste.it/72pxf

See this issue.

i saw that one when doing a search ... not sure if that's applicable to me but how do i "had to purge queue to fix the problem"?

I believe it refers to deleting the files in the directory that path.queue points to.