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The optimization is already running
com.jaeksoft.searchlib.SearchLibException: The optimization is already running	at com.jaeksoft.searchlib.web.controller.runtime.CommandsController.onOptimize(CommandsController.java:158)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:205)	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138)	at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:306)	at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:329)	at org.zkoss.zk.ui.AbstractComponent$ForwardListener.onEvent(AbstractComponent.java:3054)	at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:192)	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138)	at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1626)	at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1410)	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1134)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:562)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:457)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:465)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Thread.java:722)