[Solr Wiki] Update of "UpdateRequestProcessor" by HossMan

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The "UpdateRequestProcessor" page has been changed by HossMan:
https://wiki.apache.org/solr/UpdateRequestProcessor?action=diff&rev1=15&rev2=16

Comment:
note about default="true"

  solrconfig.xml files can contain any number of !UpdateRequestProcessorChains...
  
  {{{
-  <updateRequestProcessorChain name="mychain" >
+  <updateRequestProcessorChain name="mychain" default="true">
     <processor class="solr.CustomUpdateRequestProcessorFactory" >
       <lst name="name">
         <str name="n1">x1</str>
@@ -24, +24 @@

  }}}
  
  Allmost all processor chains should end with an instance of {{{RunUpdateProcessorFactory}}} unless the user is explicitly executing the update commands in an alternative custom {{{!UpdateRequestProcessorFactory}}}.
+ 
+ At most one processor may be configured as the "default".  if no processor is configured as a default, then an implicit default useing {{{LogUpdateProcessorFactory}}} and {{{RunUpdateProcessorFactory}}} is created for you.
  
  = Selecting the UpdateChain for Your Request =