: You can upload new schema.xml (along with other configuration files) : and reload the collection using collections API : (http://wiki.apache.org/solr/SolrCloud#Managing_collections_via_the_Collections_API). : However you have remember that in order for the new field to be usable : documents needs to be re-indexed.
You can also switch to the new "Managed Schema" mode of operation and use a REST API to add fields to your schema w/o even needing a collection reload... https://cwiki.apache.org/confluence/display/solr/Managed+Schema+Definition+in+SolrConfig https://cwiki.apache.org/confluence/display/solr/Schema+API -Hoss
