title: Cloudant - search index for free text search - collecting values into String VS Array
body: <p>Considering documents like</p>
  
  <pre><code>{ firstName: "Jack", lastName: "Smith"}
  </code></pre>
  
  <p>and</p>
  
  <pre><code>{firstName: "Simon", lastName"Jackson"}
  </code></pre>
  
  <p>to build up a search index for "free-text" - I can do either:</p>
  
  <pre><code>for(var key in doc)
    index("default", doc[key], {"store":true});
  //e.g. resulting field = default:["Jack", "Smith"]
  </code></pre>
  
  <p>OR</p>
  
  <pre><code>var indexString = "";
  for(var key in doc)
    indexString += " " + doc[key];
  
  index("default", indexString, {"store":true}); 
  //e.g. resulting field = default:"Jack Smith"
  </code></pre>
  
  <p>Is there are performance / search quality difference?</p>