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From Apache Wiki <>
Subject [Solr Wiki] Update of "FAQ" by HossMan
Date Wed, 30 Sep 2009 00:45:41 GMT
Dear Wiki user,

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The "FAQ" page has been changed by HossMan:

  This might also be caused by starting two Solr instances on the same port and killing one,
see [[|Hoss's comment]] in SOLR-118.

+ == What does "CorruptIndexException: Unknown format version" mean ? ==
+ This happens when the Lucene code in Solr used to read the index files from disk encounters
index files in a format it doesn't recognize.  
+ The most common cause is from using a version of Solr+Lucene that is older then the version
used to create that index.
  = Searching =
  == How to make the search use AND semantics by default rather than OR? ==

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