How to change schema field type from string to tdate as we already have lots of data indexed and after just changing type into schema file getting following error. Please help...
{
"error":
{
"trace":"java.lang.NullPointerException\n\tat org.apache.lucene.util.LegacyNumericUtils.prefixCodedToLong(LegacyNumericUtils.java:189)\n\tat org.apache.solr.schema.TrieField.toObject(TrieField.java:157)\n\tat org.apache.solr.schema.TrieDateField.toObject(TrieDateField.java:92)\n\tat org.apache.solr.schema.TrieDateField.toObject(TrieDateField.java:85)\n\tat org.apache.solr.schema.TrieField.write(TrieField.java:324)\n\tat org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:133)\n\tat org.apache.solr.response.JSONWriter.writeSolrDocument(JSONResponseWriter.java:345)\n\tat org.apache.solr.response.TextResponseWriter.writeDocuments(TextResponseWriter.java:249)\n\tat org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:151)\n\tat org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:183)\n\tat org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:299)\n\tat org.apache.solr.response.JSONWriter.writeResponse(JSONResponseWriter.java:95)\n\tat org.apache.solr.response.JSONResponseWriter.write(JSONResponseWriter.java:60)\n\tat org.apache.solr.response.QueryResponseWriterUtil.writeQueryResponse(QueryResponseWriterUtil.java:65)\n\tat org.apache.solr.servlet.HttpSolrCall.writeResponse(HttpSolrCall.java:731)\n\tat org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:473)\n\tat org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:257)\n\tat org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:208)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)\n\tat org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)\n\tat org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:513)\n\tat org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)\n\tat org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160)\n\tat org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)\n\tat org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)\n\tat org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)\n\tat org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)\n\tat org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)\n\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)\n\tat org.eclipse.jetty.server.Server.handle(Server.java:518)\n\tat org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)\n\tat org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244)\n\tat org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)\n\tat org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)\n\tat org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)\n\tat org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246)\n\tat org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156)\n\tat org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)\n\tat org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)\n\tat java.lang.Thread.run(Thread.java:745)\n",
"code":500}
}