Hello! I am trying to perform a library upgrade. I got the following exception. 
Any advice on how to fix it?
I am thinking if I should investigate with an heapdump or if some expert 
already encountered the problem and it is an easy fix to be done.
I am not using solrcloud but legacy standalone solr app.
2020-03-07 00:12:53.182 INFO  
(searcherExecutor-10-thread-1-processing-x:jobs_es_1) [   x:jobs_es_1] 
o.a.s.c.SolrCore [jobs_es_1] Registered new searcher 
Searcher@1ad67899[jobs_es_1] 
main{ExitableDirectoryReader(UninvertingDirectoryReader())}2020-03-07 
00:13:18.908 INFO  (qtp836220863-16) [   ] o.a.s.s.HttpSolrCall [admin] 
webapp=null path=/admin/cores params={wt=json} status=0 QTime=22020-03-07 
00:13:18.909 INFO  (qtp836220863-16) [   ] o.a.s.s.HttpSolrCall Unable to write 
response, client closed connection or we are shutting down => 
org.eclipse.jetty.io.EofException: Closed at 
org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:676)org.eclipse.jetty.io.EofException:
 Closed at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:676) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.apache.solr.servlet.ServletOutputStreamWrapper.write(ServletOutputStreamWrapper.java:126)
 ~[?:?] at 
org.apache.solr.response.QueryResponseWriterUtil$1.write(QueryResponseWriterUtil.java:54)
 ~[?:?] at java.io.OutputStream.write(OutputStream.java:116) ~[?:1.8.0_161] at 
sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221) ~[?:1.8.0_161] at 
sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291) ~[?:1.8.0_161] 
at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:295) ~[?:1.8.0_161] at 
sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:141) ~[?:1.8.0_161] at 
java.io.OutputStreamWriter.flush(OutputStreamWriter.java:229) ~[?:1.8.0_161] at 
org.apache.solr.common.util.FastWriter.flush(FastWriter.java:136) ~[?:?] at 
org.apache.solr.response.QueryResponseWriterUtil.writeQueryResponse(QueryResponseWriterUtil.java:66)
 ~[?:?] at 
org.apache.solr.servlet.HttpSolrCall.writeResponse(HttpSolrCall.java:892) 
~[?:?] at 
org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:812) 
~[?:?] at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:558) 
~[?:?] at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:419)
 ~[?:?] at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:351)
 ~[?:?] at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
 ~[jetty-servlet-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540) 
~[jetty-servlet-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) 
~[jetty-security-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1711)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1347)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480) 
~[jetty-servlet-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1678)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1249)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:152)
 ~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
 ~[jetty-rewrite-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.Server.handle(Server.java:505) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267) 
~[jetty-server-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
 ~[jetty-io-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) 
~[jetty-io-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) 
~[jetty-io-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
 ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
 ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
 ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
 ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:781)
 ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610] at 
org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:917)
 ~[jetty-util-9.4.19.v20190610.jar:9.4.19.v20190610] at 
java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]

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