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java.lang.ClassCastException: class org.apache.solr.handler.dataimport.DataImportHandler	at java.lang.Class.asSubclass(Class.java:3208)	at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:475)	at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:422)	at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:567)	at org.apache.solr.core.PluginBag.createPlugin(PluginBag.java:122)	at org.apache.solr.core.PluginBag.init(PluginBag.java:217)	at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:130)	at org.apache.solr.core.SolrCore.(SolrCore.java:773)	at org.apache.solr.core.SolrCore.(SolrCore.java:659)	at org.apache.solr.core.CoreContainer.create(CoreContainer.java:727)	at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:447)	at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:438)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$1.run(ExecutorUtil.java:210)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)