Improve IndexWriter javadoc on locking
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                 Key: LUCENE-1877
                 URL: https://issues.apache.org/jira/browse/LUCENE-1877
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Javadocs
            Reporter: Mark Miller
            Priority: Trivial
             Fix For: 2.9


A user requested we add a note in IndexWriter alerting the availability of 
NativeFSLockFactory (allowing you to avoid retaining locks on abnormal jvm 
exit). Seems reasonable to me - we want users to be able to easily stumble upon 
this class. The below code looks like a good spot to add a note - could also 
improve whats there a bit - opening an IndexWriter does not necessarily create 
a lock file - that would depend on the LockFactory used.


{code}  <p>Opening an <code>IndexWriter</code> creates a lock file for the 
directory in use. Trying to open
  another <code>IndexWriter</code> on the same directory will lead to a
  {...@link LockObtainFailedException}. The {...@link LockObtainFailedException}
  is also thrown if an IndexReader on the same directory is used to delete 
documents
  from the index.</p>{code}

Anyone remember why NativeFSLockFactory is not the default over 
SimpleFSLockFactory?

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