title: Error - Rebuild search index with django-oscar and Solr
body: <p>I'm following the  <a href="http://django-oscar.readthedocs.io/en/latest/howto/how_to_setup_solr.html#installing-solr" rel="nofollow noreferrer"> django documentation</a> to integrate solr with django-Oscar.I'm getting the following error when trying to rebuild the index.How can I fix this issue?</p>
  
  <pre>
  <b>$python3 manage.py rebuild_index --noinput</b>
  
  Removing all documents from your index because you said so.
  
      Failed to clear Solr index: Solr responded with an error (HTTP 500): [Reason: Error 500 {msg=SolrCore 'collection1' is not available due to init failure: Schema Parsing Failed: unknown field 'id'. Schema file is /project/solr-4.7.2/example/solr/collection1/schema.xml,trace=org.apache.solr.common.SolrException: SolrCore 'collection1' is not available due to init failure: Schema Parsing Failed: unknown field 'id'. Schema file is /project/solr-4.7.2/example/solr/collection1/schema.xml
          at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:827)
          at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:305)
          at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:205)
          at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
          at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
          at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
          at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
          at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
          at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
          at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
          at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
          at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
          at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
          at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
          at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
          at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
          at org.eclipse.jetty.server.Server.handle(Server.java:368)
          at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
          at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
          at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:953)
          at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1014)
          at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:861)
          at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
          at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
          at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
          at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
          at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
          at java.lang.Thread.run(Thread.java:748)
      Caused by: org.apache.solr.common.SolrException: Schema Parsing Failed: unknown field 'id'. Schema file is /project/solr-4.7.2/example/solr/collection1/schema.xml
          at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:618)
          at org.apache.solr.schema.IndexSchema.(IndexSchema.java:166)
          at org.apache.solr.schema.IndexSchemaFactory.create(IndexSchemaFactory.java:55)
          at org.apache.solr.schema.IndexSchemaFactory.buildIndexSchema(IndexSchemaFactory.java:69)
          at org.apache.solr.core.CoreContainer.createFromLocal(CoreContainer.java:559)
          at org.apache.solr.core.CoreContainer.create(CoreContainer.java:597)
          at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:258)
          at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:250)
          at java.util.concurrent.FutureTask.run(FutureTask.java:266)
          at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
          at java.util.concurrent.FutureTask.run(FutureTask.java:266)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
          ... 1 more
      Caused by: java.lang.RuntimeException: unknown field 'id'
          at org.apache.solr.schema.IndexSchema.getIndexedField(IndexSchema.java:340)
          at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:536)
          ... 13 more
      ,code=500}]
      Traceback (most recent call last):
        File "/home/asanka/.local/lib/python3.5/site-packages/haystack/backends/solr_backend.py", line 105, in clear
          self.conn.delete(q='*:*', commit=commit)
        File "/home/asanka/.local/lib/python3.5/site-packages/pysolr.py", line 948, in delete
          return self._update(m, commit=commit, softCommit=softCommit, waitFlush=waitFlush, waitSearcher=waitSearcher, handler=handler)
        File "/home/asanka/.local/lib/python3.5/site-packages/pysolr.py", line 488, in _update
          return self._send_request('post', path, message, {'Content-type': 'text/xml; charset=utf-8'})
        File "/home/asanka/.local/lib/python3.5/site-packages/pysolr.py", line 403, in _send_request
          raise SolrError(error_message % (resp.status_code, solr_message))
      pysolr.SolrError: Solr responded with an error (HTTP 500): [Reason: Error 500 {msg=SolrCore 'collection1' is not available due to init failure: Schema Parsing Failed: unknown field 'id'. Schema file is /home/asanka/Music/devBranch/dailyDeal_v3/main_app/solr-4.7.2/example/solr/collection1/schema.xml,trace=org.apache.solr.common.SolrException: SolrCore 'collection1' is not available due to init failure: Schema Parsing Failed: unknown field 'id'. Schema file is /home/asanka/Music/devBranch/dailyDeal_v3/main_app/solr-4.7.2/example/solr/collection1/schema.xml
          at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:827)
          at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:305)
          at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:205)
          at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
          at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
          at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
          at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
          at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
          at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
          at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
          at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
          at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
          at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
          at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
          at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
          at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
          at org.eclipse.jetty.server.Server.handle(Server.java:368)
          at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
          at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
          at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:953)
          at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1014)
          at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:861)
          at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
          at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
          at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
          at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
          at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
          at java.lang.Thread.run(Thread.java:748)
      Caused by: org.apache.solr.common.SolrException: Schema Parsing Failed: unknown field 'id'. Schema file is /home/asanka/Music/devBranch/dailyDeal_v3/main_app/solr-4.7.2/example/solr/collection1/schema.xml
          at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:618)
          at org.apache.solr.schema.IndexSchema.(IndexSchema.java:166)
          at org.apache.solr.schema.IndexSchemaFactory.create(IndexSchemaFactory.java:55)
          at org.apache.solr.schema.IndexSchemaFactory.buildIndexSchema(IndexSchemaFactory.java:69)
          at org.apache.solr.core.CoreContainer.createFromLocal(CoreContainer.java:559)
          at org.apache.solr.core.CoreContainer.create(CoreContainer.java:597)
          at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:258)
          at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:250)
          at java.util.concurrent.FutureTask.run(FutureTask.java:266)
          at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
          at java.util.concurrent.FutureTask.run(FutureTask.java:266)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
          ... 1 more
      Caused by: java.lang.RuntimeException: unknown field 'id'
          at org.apache.solr.schema.IndexSchema.getIndexedField(IndexSchema.java:340)
          at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:536)
          ... 13 more
      ,code=500}]
  
  All documents removed.
  
  </pre>