Hello Ann, I am not doing any migration but my log as below. it woting one time only
2020.05.24 15:40:35 WARN web[][o.a.c.l.WebappClassLoaderBase] The web application [sonar] appears to have started a thread named [elasticsearch[_client_][generic][T#1]] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
java.base@11.0.5/java.util.concurrent.LinkedTransferQueue.awaitMatch(LinkedTransferQueue.java:743)
java.base@11.0.5/java.util.concurrent.LinkedTransferQueue.xfer(LinkedTransferQueue.java:684)
java.base@11.0.5/java.util.concurrent.LinkedTransferQueue.take(LinkedTransferQueue.java:1366)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1054)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1114)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
java.base@11.0.5/java.lang.Thread.run(Thread.java:834)
2020.05.24 15:40:35 WARN web[][o.a.c.l.WebappClassLoaderBase] The web application [sonar] appears to have started a thread named [elasticsearch[_client_][transport_worker][T#2]] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.5/sun.nio.ch.EPoll.wait(Native Method)
java.base@11.0.5/sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:120)
java.base@11.0.5/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:124)
java.base@11.0.5/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:136)
app//io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
app//io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:765)
app//io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:413)
app//io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909)
java.base@11.0.5/java.lang.Thread.run(Thread.java:834)
2020.05.24 15:40:35 WARN web[][o.a.c.l.WebappClassLoaderBase] The web application [sonar] appears to have started a thread named [elasticsearch[_client_][transport_worker][T#3]] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.5/sun.nio.ch.EPoll.wait(Native Method)
java.base@11.0.5/sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:120)
java.base@11.0.5/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:124)
java.base@11.0.5/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:136)
app//io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
app//io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:765)
app//io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:413)
app//io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909)
java.base@11.0.5/java.lang.Thread.run(Thread.java:834)
2020.05.24 15:40:35 WARN web[][o.a.c.l.WebappClassLoaderBase] The web application [sonar] appears to have started a thread named [elasticsearch[_client_][transport_worker][T#4]] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.5/sun.nio.ch.EPoll.wait(Native Method)
java.base@11.0.5/sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:120)
java.base@11.0.5/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:124)
java.base@11.0.5/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:136)
app//io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
app//io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:765)
app//io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:413)
app//io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909)
java.base@11.0.5/java.lang.Thread.run(Thread.java:834)
2020.05.24 15:40:35 INFO web[][o.s.s.a.EmbeddedTomcat] HTTP connector enabled on port 9001
2020.05.24 15:40:35 INFO web[][o.s.p.ProcessEntryPoint] Hard stopping process
2020.05.24 15:40:35 WARN web[][o.s.p.ProcessEntryPoint$StopperThread] Can not stop in 270000ms
2020.05.24 15:40:35 INFO web[][o.s.s.app.WebServer] WebServer stopped