[Jackrabbit Wiki] Update of "IndexingConfiguration" by BertrandDelacretaz

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The following page has been changed by BertrandDelacretaz:
http://wiki.apache.org/jackrabbit/IndexingConfiguration

The comment on the change is:
Mention automatic re-indexing of aggregated items

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  Sometimes it is useful to include the contents of descendant nodes into a single node to easier search on content that is scattered across multiple nodes.
  
  Jackrabbit allows you to define index aggregates based on relative path patterns and primary node types.
+ 
+ Changes to aggregated items cause the main item to be reindexed, even if it was not modified. The indexer observes the workspace for any relevant changes, and reindexes affected items automatically.
  
  The following example creates an index aggregate on nt:file that includes the content of the jcr:content node: