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doc: add master/slave upgrade note 

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/branches/solr@923563 13f79535-47bb-0310-9956-ffa450edef68
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Yonik Seeley 2010-03-16 03:07:45 +00:00
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@ -27,6 +27,9 @@ Upgrading from Solr 1.4
* The Lucene index format has changed and as a result, once you upgrade,
previous versions of Solr will no longer be able to read your indices.
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.
* The experimental ALIAS command has been removed (SOLR-1637)