[Search] Enhance Lucene word boundaries / stopwords handling

[plutonik-a]

Try out different Lucene analyzers and/or add advanced search form controls to see what combination can produce our expected results

For more on stopwords, see:

• Lucene's default list of stopwords: https://stackoverflow.com/questions/17527741/what-is-the-default-list-of-stopwords-used-in-lucenes-stopfilter
• Pros/cons of stopwords: https://www.elastic.co/guide/en/elasticsearch/guide/current/stopwords.html (linked from the stackoverflow page above)
• Example of how our use of default stopwords leads to unexpected/unwanted search hits, see https://twitter.com/awmarrs/status/893213357251203077

Originally posted by @joewiz in

• Assemble list of quirks with our full text search engine (esp. punctuation) #255 (comment)
• Assemble list of quirks with our full text search engine (esp. punctuation) #255 (comment)
• Assemble list of quirks with our full text search engine (esp. punctuation) #255 (comment)
• Assemble list of quirks with our full text search engine (esp. punctuation) #255 (comment)