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Server at http://localhost:8080/solr/search returned non ok status:500, message:Internal Server Error
java.net.ConnectException: Connection refused	at java.net.PlainSocketImpl.socketConnect(Native Method)	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:579)	at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:117)	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)	at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:304)	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)	at org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:448)	at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)	at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)	at org.apache.solr.client.solrj.request.QueryRequest.process(QueryRequest.java:91)	at org.apache.solr.client.solrj.SolrServer.query(SolrServer.java:301)	at org.dspace.discovery.SolrServiceImpl.cleanIndex(SolrServiceImpl.java:477)	at org.dspace.discovery.IndexClient.main(IndexClient.java:126)	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:606)	at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:226)	at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:78)