Solr has built-in CSV export and import facilities, which can be used to copy data from one core to another.
You can use the following process to select documents from one core and move them to another, using only the Solr Admin UI, Chrome, and curl.
- Use the Solr Admin UI's Query screen to formulate a query for the subset of documents you want to dump.
- Run the query and click on the link that gives you the raw query results.