I think you question is too specific. We could just answer: Yes or No.
When abstracting the question to
- What tools are out there for an Intranet search engine across a diverse toolset?
- or just googling for "intranet search open source"
You will find much more.
- Solr + Nutch is an option
- probably you will also require Apache ManifoldCF
- if you want those wrapped up, you maybe better of with OpenESP