Missing from the current Nutch documentation (Tutorial, FAQ) is a list of features. This wiki page could help, if someone who knows the answers can edit it.

(Please reformat this text and divide into feature lists, questions and questions & answers).

Features

• Fetching, parsing and indexation in parallel and/ou distributed
• Plugins
• Many formats: plain text, HTML, XML, ZIP, OpenDocument (OpenOffice.org), Microsoft Office (Word, Excel, Powerpoint), PDF, JavaScript, RSS, RTF, MP3 (ID3 tags)
• Ontology
• Clustering
• MapReduce ;
• Distributed filesystem (via Hadoop)
• Link-graph database
• NTLM authentication
  

Questions and Answers

 *What kind of searches does Nutch support? (quoted, nested, truncation, wildcarding \[and where\], Boolean),

• "...." (phrase search?), + (what is this for?), - (negation) and fieldname:term. No "AND" or "OR". The and-logic is implied.
  *Is stemming an option?
• According to the Lucene in Action book: "Nutch does not use stemming or term aliasing of any kind. Search engines have not historically done much stemming, but it is a question that comes up regularly." – page 329
  *What kind of stemming does Nutch use? (and can you add exceptions/changes?)
• See previous answer
  *Does Nutch support Boolean operators? (can you use Google-like plus or minus or are you stuck with 1990s terms?)
• No
  *How does the search engine handle punctuation and special characters? (and what's configurable?)
• They are treated like a space.
  *Which document formats are supported?

• Guessing from the names of the available parser plugins, this is probably it. However, only the plain text and HTML are enabled by default. Edit conf/nutch-site.xml and change the value of plugin.includes property to include the plugins for the document types that you want Nutch to handle:
  • Plain Text (plugin: parse-text)
  • HTML (parse-html)
  • XML (parse-xml) uses XPath and namespaces to do the mapping between XML elements and Lucene fields.
  • JavaScript (for extracting links only?) (parse-js)
  • OpenOfice.org ODF (parse-oo) parses Open Office and Star Office documents.
  • Microsoft Power Point, the .ppt file (parse-mspowerpoint)
  • Microsoft Word, the .doc file (parse-msword)
  • Adobe PDF (parse-pdf)
  • RSS (parse-rss)
  • RTF (parse-rtf)
  • MP3 Is there any text in MP3? (parse-mp3) (JR: Sure, the mp3 itself contains the ID3v1 or ID3v2 tags which contain song information like
    title, artist, album, comments, etc. The useful information needed to search mp3s)
  • ZIP This seems to expand the zip of plain text files and return the concatenated text. (parse-zip)
    
    

Questions without Answers

*Does Nutch support weighted field searching, synonym support?

*What kinds of indexes does Nutch build? (multi-format indexing, incremental indexing, spell-check support, thesauri support, fielded searching, rank-by-reputation?)

*What post-coordination options are available? (hey Karen, what does this mean?)

*How easy is Nutch to configure?

*How transparent is its configuration to a working organization: does it require geeky command line stuff, or can a knowledgable manager enter a web or software interface to view or modify settings?

• How are results sorted?
  
• Does Nutch support deduping?
  
• Can one tinker with relevance algoritms?
  
• Are there ranking overrides?