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add compat note about snowball changes
git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@689517 13f79535-47bb-0310-9956-ffa450edef68
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@ -29,6 +29,10 @@ IMPORTANT UPGRADE NOTE: In a master/slave configuration, all searchers/slaves
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should be upgraded before the master! If the master were to be updated
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first, the older searchers would not be able to read the new index format.
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The Porter snowball based stemmers in Lucene were updated (LUCENE-1142),
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and are not guaranteed to be backward compatible at the index level
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(the stem of certain words may have changed). Re-indexing is recommended.
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Older Apache Solr installations can be upgraded by replacing
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the relevant war file with the new version. No changes to configuration
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files should be needed.
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