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The "FAQ" page has been changed by HossMan: http://wiki.apache.org/solr/FAQ?action=diff&rev1=60&rev2=61 This might also be caused by starting two Solr instances on the same port and killing one, see [[http://issues.apache.org/jira/browse/SOLR-118#action_12507990|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? ==
