I unloaded the default Solr Collection by mistake from the Solr Admin UI

Question

How do I reload it into Solr again? If I try to launch the Solr Admin UI, I get the following message:

There are no SolrCores running. Using the Solr Admin UI currently requires at least one SolrCore.

Answer 1

You will need to modify the <cores> entry in the solr.xml file that is in the root of where your Solr instance is running and add at least one <core> entry. Below is the example that comes with the Solr distribution.

      <cores adminPath="/admin/cores" defaultCoreName="collection1">
         <core name="collection1" instanceDir="." />
       </cores>

You will need to modify this according to your local settings. You can reference more information on Cores and their settings in the CoreAdmin Solr Wiki page.