[Solr Wiki] Update of "Atomic_Updates" by CassandraTargett

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The "Atomic_Updates" page has been changed by CassandraTargett:
https://wiki.apache.org/solr/Atomic_Updates?action=diff&rev1=5&rev2=6

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Add header for content moved to CWIKI

+ {{{#!wiki important
+ This page exists for the Solr Community to share Tips, Tricks, and Advice about 
+ [[https://cwiki.apache.org/confluence/display/solr/Updating+Parts+of+Documents#UpdatingPartsofDocuments-AtomicUpdates|Atomic Updates]].
+ 
+ Reference material previously located on this page has been migrated to the 
+ [[https://cwiki.apache.org/solr/|Official Solr Reference Guide]].
+ If you need help, please consult the Ref Guide for the version of Solr you are using 
+ for the specific details about using [[https://cwiki.apache.org/confluence/display/solr/Updating+Parts+of+Documents#UpdatingPartsofDocuments-AtomicUpdates|this feature]].
+ 
+ If you'd like to share information about how you use this feature, please [[FrontPage#How_to_edit_this_Wiki|add it to this page]].
+ /* cwikimigrated */
+ }}}
+ 
+ 
  <!> [[Solr4.0]]
  
  = Atomic Updates =
  
- Atomic Updates is a new feature in Solr 4.0 that allows you to update on a field level rather than on a document level (In previous versions). This means that you can update individual fields without having to send the entire document to Solr with the un-updated fields values. Internally Solr re-adds the document to the index with the updated fields.
+ Atomic Updates is a feature added in Solr 4.0 that allows you to update on a field level rather than on a document level (In previous versions). This means that you can update individual fields without having to send the entire document to Solr with the un-updated fields values. Internally Solr re-adds the document to the index with the updated fields.
  
  <<TableOfContents(2)>>
  
- = Available Modifiers =
- 
-  * {{{set}}} – sets or replaces a particular value, or remove the value if {{{null}}} is specified as the new value. <!> Note: In the case of multi-valued fields if {{{null}}} is specified on {{{set}}} all the values in the field are removed. See [[https://issues.apache.org/jira/browse/SOLR-3862|SOLR-3862]]
-  * {{{add}}} – adds an additional value to a multi-valued field
-  * {{{inc}}} – increments a numeric value by a specific amount
- 
- Example syntaxes...
- 
-  * [[UpdateJSON#Solr_4.0_Example | Update JSON Example]]
-  * [[UpdateXmlMessages#Optional_attributes_for_.22field.22 | Update XML Example]]
- 
  = Caveats and Limitations =
- 
- == Stored Values ==
- 
- The core functionality of atomically updating a document requires that all fields in your SchemaXml must be configured as {{{stored="true"}}} except for fields which are {{{<copyField/>}}} destinations -- which must be configured as {{{stored="false"}}}.  This is because the atomic updates are applied to the document represented by the existing stored field values.  This means there another requirement related to copyField destinations:  All data in these fields must originate from ''ONLY'' copyField sources.  If such fields contain some information that comes from the indexing program and some information that comes from copyField, then the information which originally came from the indexing program will likely be lost when an atomic update is made.
  
  == Update Log ==