title: Indexing json on Solr, it indexed as a List instead of as an item
body: <p>I'm trying to index a JSON file in Solr and it works, but i don't understant why Solr is indexing elements as an array instead of an element. </p>
  
  <p>When I indexed the example json file "books.json" it works fine, but if I index another file "items.json" it generates a different output.</p>
  
  <p>I show below:</p>
  
  <p><strong>Books.json</strong></p>
  
  <pre><code> [{
      "id" : "978-0641723445",
      "cat" : ["book","hardcover"],
      "name" : "The Lightning Thief",
      "author" : "Rick Riordan",
      "series_t" : "Percy Jackson and the Olympians",
      "sequence_i" : 1,
      "genre_s" : "fantasy",
      "inStock" : true,
      "price" : 12.50,
      "pages_i" : 384
    }]
  
   OUTPUT
  
  {
      "id": "978-0641723445",
      "cat": [
        "book",
        "hardcover"
       ],
      "name": "The Lightning Thief",
      "author": "Rick Riordan",
      "author_s": "Rick Riordan",
      "series_t": "Percy Jackson and the Olympians",
      "sequence_i": 1,
      "genre_s": "fantasy",
      "inStock": true,
      "price": 12.5,
      "price_c": "12.5,USD",
      "pages_i": 384,
      "_version_": 1457847842153431000
  },
  </code></pre>
  
  <p><strong>Items.json</strong></p>
  
  <pre><code>[{ 
      "title" : "Pruebas Carlos",
      "id" : 14,
       "desc" : "Probando como funciona el campo de descripciones"
  }]
  
  OUTPUT
  
  {
      "title": [
         "Pruebas Carlos"
      ],
      "id": "10",
      "desc": [
        "Probando como funciona el campo de descripciones"
      ],
      "_version_": 1457849881416695800
  },
  </code></pre>
  
  <p><a href="http://pastebin.com/SneLYSEu" rel="nofollow">My Schema</a>, where i only added the new fields that i need.</p>
  
  <p>Can someone explain to me how I have to do to index the elements without []?</p>
  
  <p>Thanks</p>