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The "Atomic_Updates" page has been changed by TadhgMulkern: http://wiki.apache.org/solr/Atomic_Updates New page: <!> [[Solr4.0]] = Atomic Updates = <<TableOfContents(2)>> == Introduction == 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 document to Solr with the update fields values. Internally Solr re-adds the document to the index with the updated fields. == 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 [[http://wiki.apache.org/solr/UpdateJSON#Solr_4.0_Example | Update JSON Example]] <<BR>> [[http://wiki.apache.org/solr/UpdateXmlMessages#Optional_attributes_for_.22field.22 | Update XML Example]] = References = https://issues.apache.org/jira/browse/SOLR-139 <<BR>> http://yonik.com/solr/atomic-updates/