I'm considering "indexing" my org-mode files and haven't done any research into 

this.  I'm sure there's 100 different ways to do this but wanted to ask the list if anyone

is indexing their org-mode files and using a search tool like Solr, Elastic or smaller indexing engines to search their org-files.

Emacs integration obviously would be a plus.

Thanks for any feedback,

--Nate