open-semantic-search Apache_Solr_HttpTransportException: '500' Status

Hey Guys,

iam running OSS on Ubuntu 16.10 (fresh install) with around 10.000 PDF files indexed. Every time i manually stop and start solr or reboot the entire system i run into the following error on the /search/ page:

`Error:

Apache_Solr_HttpTransportException: '500' Status: Internal Server Error in /usr/share/solr-php-ui/Apache/Solr/Service.php:338 Stack trace: #0 /usr/share/solr-php-ui/Apache/Solr/Service.php(1170): Apache_Solr_Service->_sendRawGet('http://localhos...') #1 /usr/share/solr-php-ui/index.php(1399): Apache_Solr_Service->search('test', 0, 10, Array) #2 {main}`

as iam really new to oss i tried to find something in the solr log files and got this one:

2019-02-19 13:42:17.370 ERROR (qtp1582028874-55) [ ] o.a.s.s.HttpSolrCall null:org.apache.solr.core.SolrCoreInitializationException: SolrCore 'opensemanticsearch' is not available due to init failure: Failed to create new ManagedResource /schema/analysis/synonyms/skos of type org.apache.solr.rest.schema.analysis.ManagedSynonymGraphFilterFactory$SynonymManager due to: java.lang.IllegalArgumentException: term: was completely eliminated by analyzer at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:1593) at org.apache.solr.servlet.HttpSolrCall.init(HttpSolrCall.java:249) at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:469) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.Server.handle(Server.java:531) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: org.apache.solr.common.SolrException: Failed to create new ManagedResource /schema/analysis/synonyms/skos of type org.apache.solr.rest.schema.analysis.ManagedSynonymGraphFilterFactory$SynonymManager due to: java.lang.IllegalArgumentException: term: was completely eliminated by analyzer at org.apache.solr.core.SolrCore.<init>(SolrCore.java:1014) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:869) at org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1138) at org.apache.solr.core.CoreContainer.lambda$load$13(CoreContainer.java:684) at com.codahale.metrics.InstrumentedExecutorService$InstrumentedCallable.call(InstrumentedExecutorService.java:197) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:209) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ... 1 more

if i remove all packages and config files and reinstall them again from the deb file, everything works fine until the next reboot.

it would be great if someone could give me a hint or something helpfull.

thanks in advance :-)