All the search criteria I require are declared as properties of my node type.  Indexing the content is unnecessary, and rebuilding the indexes when they appear corrupted must take longer.

I have read the wiki page about indexing_configuration.xml, if it is badly configured I get an error but after rebuilding the indexes I can still find based on file content.

I added this:
 <index-rule nodeType="jcr:content">


thinking all the jcr:content properties would be excluded, but that doesnt seem to have made any difference.