Disable/enable autocommit on the fly
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                 Key: SOLR-2664
                 URL: https://issues.apache.org/jira/browse/SOLR-2664
             Project: Solr
          Issue Type: New Feature
          Components: update
    Affects Versions: 4.0
            Reporter: Simon Rosenthal
            Priority: Minor
             Fix For: 4.0


There are occasions when although autocommit is configured, it would be 
desirable to disable it temporarily - for instance when batch adding/updating a 
set of documents which should be committed atomically (e.g. a set of price 
changes).

The patch adds <disableAutoCommit/> and </enableAutoCommit> commands to 
XMLUpdateHandler, and also adds a disableAutoCommit=true|false attribute to the 
<add> element - this will disable autocommit until the terminating </add> at 
the end of the XML document is reached.

At present, the autocommit state will not survive a core reload.

It should be possible to extend this functionality to SolrJ, CSVUpdatehandler ( 
and JSONUpdateHandler ?)

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