Robert Muir created LUCENE-5228:
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             Summary: IndexWriter.addIndexes copies raw files but acquires no 
locks
                 Key: LUCENE-5228
                 URL: https://issues.apache.org/jira/browse/LUCENE-5228
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Robert Muir


I see stuff like: "merge problem with lucene 3 and 4 indices" (from solr users 
list), and cannot even think how to respond to these users because so many 
things can go wrong with IndexWriter.addIndexes(Directory)

it currently has in its javadocs:

NOTE: the index in each Directory must not be changed (opened by a writer) 
while this method is running. This method does not acquire a write lock in each 
input Directory, so it is up to the caller to enforce this. 

This method should be acquiring locks: its copying *RAW FILES*. Otherwise we 
should remove it. If someone doesnt like that, or is mad because its 10ns 
slower, they can use NoLockFactory. 


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