I need open source search engine api for searching the files on my server. The files includes text file,pdf file audio file, in short maximum formats supported. I had one option for lucene 3.5.0 which searches the plain text and according to servey its one of best. Any suggesations would be helpful
Lucene is your friend. Have a look at http://wiki.apache.org/lucene-java/LuceneFAQ