How does the magic work? What is inside the indexes? Why is a certain
    record found by a search, and another not?. The answer is in the
    inverted indexes. You can easily investigate them using the
    special Zebra schema
    zebra::index::fieldname. In this example you
    can see that the title index has both word
    (type :w) and phrase (type
    :p) 
    indexed fields, 
    
     http://localhost:9999/?version=1.1&operation=searchRetrieve&x-pquery=the&startRecord=1&maximumRecords=1&recordSchema=zebra::index::title
        
   
    But where in the indexes did the term match for the query occur?
    Easily answered with the special  Zebra schema
    zebra::snippet. The matching terms are
    encapsulated by <s> tags. 
    
     http://localhost:9999/?version=1.1&operation=searchRetrieve&x-pquery=the&startRecord=1&maximumRecords=1&recordSchema=zebra::snippet
        
   
    How can I refine my search? Which interesting search terms are
    found inside my hit set? Try the special  Zebra schema
    zebra::facet::fieldname:type. In this case, we
    investigate additional search terms for the
    title:w index.
    
     http://localhost:9999/?version=1.1&operation=searchRetrieve&x-pquery=the&startRecord=1&maximumRecords=1&recordSchema=zebra::facet::title:w
        
   
    One can ask for multiple facets. Here, we want them from phrase
    indexes of type
    :p.
    
     http://localhost:9999/?version=1.1&operation=searchRetrieve&x-pquery=the&startRecord=1&maximumRecords=1&recordSchema=zebra::facet::publisher:p,title:p