anchor.diff:        <!--
             Delete all commit points once they have reached the given age.
             Supports DateMathParser syntax e.g.
  -          
  +
             <str name="maxCommitAge">30MINUTES</str>
             <str name="maxCommitAge">1DAY</str>
         -->
  
positive.code: 
      <!-- inherit from indexDefaults <maxFieldLength>10000</maxFieldLength> -->
  
      <!-- If true, unlock any held write or commit locks on startup. 
           This defeats the locking mechanism that allows multiple
           processes to safely access a lucene index, and should be
           used with care.
           This is not needed if lock type is 'none' or 'single'
       -->
      <unlockOnStartup>false</unlockOnStartup>
      
      <!-- If true, IndexReaders will be reopened (often more efficient) instead
           of closed and then opened.  -->
      <reopenReaders>true</reopenReaders>
  
negative.code:   <!-- DisMaxRequestHandler allows easy searching across multiple fields
         for simple user-entered phrases.  It's implementation is now
         just the standard SearchHandler with a default query type
         of "dismax".
         see http://wiki.apache.org/solr/DisMaxRequestHandler
     -->
    <requestHandler name="dismax" class="solr.SearchHandler" >
  