Filter out unnecessary fields in solrindex

[Michael Kazekin <Mi...@mediainsight.info>]

Is it possible to tell Nutch to write only some selected fields in Solr 
via solrindex? I removed several fields,
both from schema.xml and solrindex-mapping.xml, but received:

SEVERE: org.apache.solr.common.SolrException: ERROR:unknown field 'content'
     at 
org.apache.solr.update.DocumentBuilder.toDocument(DocumentBuilder.java:320)
     at 
org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:60)
     at 
org.apache.solr.update.processor.LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:115)
     at org.apache.solr.handler.XMLLoader.processUpdate(XMLLoader.java:158)
     at org.apache.solr.handler.XMLLoader.load(XMLLoader.java:79)
     at 
org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:67)
     at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
     at org.apache.solr.core.SolrCore.execute(SolrCore.java:1368)
     at 
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:356)
     at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:252)
     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
     at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
     at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:300)
     at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
     at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
     at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
     at java.lang.Thread.run(Thread.java:679)


as far as I can see from code, solrindex writes all fields to 
SolrInputDocument, but I thought that they could be
filtered somewhere else?