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org.apache.lucene.store.AlreadyClosedException: this ReferenceManager is closed	at org.apache.lucene.search.ReferenceManager.acquire(ReferenceManager.java:98)	at org.opensolaris.opengrok.configuration.RuntimeEnvironment.getIndexSearcher(RuntimeEnvironment.java:1463)	at org.opensolaris.opengrok.configuration.RuntimeEnvironment.getMultiReader(RuntimeEnvironment.java:1539)	at org.opensolaris.opengrok.web.SearchHelper.prepareExec(SearchHelper.java:265)	at org.apache.jsp.search_jsp._jspService(search_jsp.java:175)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:403)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:347)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.opensolaris.opengrok.web.AuthorizationFilter.doFilter(AuthorizationFilter.java:60)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)