Hi Jonas, Very nice article. When I try to create collection as suggested curl --negotiate -u :"http://horton04.example.com:8983/solr/admin/collections?action=CREATE&name=films#Shards=1" I get error saying - numShards is a required parameter. <?xml version="1.0" encoding="UTF-8"?> <response> <lst name="responseHeader"><int name="status">400</int><int name="QTime">24</int></lst><str name="Operation create caused exception:">org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: numShards is a required param (when using CompositeId router).</str><lst name="exception"><str name="msg">numShards is a required param (when using CompositeId router).</str><int name="rspCode">400</int></lst><lst name="error"><str name="msg">numShards is a required param (when using CompositeId router).</str><int name="code">400</int></lst> </response> I also tried to define numShards as 2 and proceed, however it return an error from one of the other datanodes curl --negotiate -u : "http://wynpocdn01.dl.uk.centricaplc.com:8983/solr/admin/collections?action=CREATE&name=films&numShards=2" <?xml version="1.0" encoding="UTF-8"?> <response> <lst name="responseHeader"><int name="status">0</int><int name="QTime">1596</int></lst><lst name="failure"><str>org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException:Error from server at http://wynpocdn03.dl.uk.centricaplc.com:8983/solr: Error CREATEing SolrCore 'films_shard1_replica1': Unable to create core [films_shard1_replica1] Caused by: bigdata</str><str>org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException:Error from server at http://wynpocdn04.dl.uk.centricaplc.com:8983/solr: Error CREATEing SolrCore 'films_shard2_replica1': Unable to create core [films_shard2_replica1] Caused by: bigdata</str></lst> </response> Any ideas what might be causing this, and how can i disable CompositeId router?? ... View more