Upgrading underlying Solr

Read Apache Solr Release Notes and apply all necessary changes.

Change solr.version property in pom.xml.

Checking overwritten classes

The following Solr classes are overwritten:

org.apache.solr.handler.dataimport.FieldReaderDataSource
org.apache.solr.handler.dataimport.XPathEntityProcessor
org.apache.solr.handler.dataimport.XPathRecordReader

You have to check if there are some upstream changes in theses classes.

They can be found upstream in solr/contrib/dataimporthandler/src/java/org/apache/solr/handler/dataimport.