Solr 1.4.0 was released on November 10, 2009
A bug fix release Solr 1.4.1 was released on June 25, 2010
If you found a link to this page in some documentation, it was placed there to alert you to the fact that it described a feature that was first introduced in the Solr 1.4 release.
This implies that older releases did not have this feature.
Post Release Notes
Upgrading from 1.3
The following instructions were inadvertantly omited from the "Upgrading from Solr 1.3" section of CHANGES.txt...
IMPORTANT UPGRADE NOTE: In a master/slave configuration, all searchers/slaves should be upgraded before the master! If the master were to be updated first, the older searchers would not be able to read the new index format. ... Older Apache Solr installations can be upgraded by replacing the relevant war file with the new version. No changes to configuration files should be needed. This version of Solr contains a new version of Lucene implementing an updated index format. This version of Solr/Lucene can still read and update indexes in the older formats, and will convert them to the new format on the first index change. Be sure to backup your index before upgrading in case you need to downgrade.
ValueSource API changes
After the final release, it was noted that SOLR-1432 was not mentioned in the CHANGES.txt file. This issue uncovered a bug in the way FunctionQueries were scored, and was exacerbated by changes made in Lucene 2.9 related to pushing scoring down to a SegmentReader level. The fix for this issue resulted in some API additions to the ValueSource class. All ValueSource implementations provided by Solr were fixed to implement this API, but third-party plugins may behave unexpectedly if they do not override this new method.