title: How "keys" and "key" filters should be used in Couchbase to filter view results?
body: <p>I have issue with key and keys filter parameter in Couchbase (Version: 3.0.0 Enterprise Edition) in the web console. Whatever value I set in those parameters, no record is returned.</p>
  
  <p>Documents look like:</p>
  
  <pre><code>{
     "folder": "F3",
     "ccy": "USD",
     "pnl": 789700,
     "maturity": "4424-10-16 00:00 AM CEST",
     "source": "BackOffice1",
     "npv": 341684,
     "symbolic_id": 880888,
     "bpv": 374000,
     "cpty": "CPTY2"
  }
  </code></pre>
  
  <p>Map function is:</p>
  
  <pre><code>function (doc, meta) {
  
   emit([doc.source,doc.cpty], doc.npv); 
  
  }
  </code></pre>
  
  <p>Reduce is the built in function</p>
  
  <pre><code>_count
  </code></pre>
  
  <p>I assume that I should be able to get all documents with the key ["BackOffice1","CPTY2"] by setting the key parameter in the querystring ?key=["BackOffice1","CPTY2"]&amp;reduce=true&amp;group=true. But nothing is returned.</p>
  
  <p>I may miss something in how we should use key and keys parameters.</p>
  
  <p>For information, startkey and endkey work as expected.</p>
  
  <p>Is there something wrong with my approach ?</p>