What's the difference between query_string and multi_match?
<p>When running this queries:</p>

<pre><code>{
  "query_string" : {
    "query" : "text",
    "fields": ["field1", "field2"]
  }
}
</code></pre>

<p>-</p>

<pre><code>{
  "multi_match" : {
    "query" : "text",
    "fields": ["field1", "field2"]
  }
}
</code></pre>

<p>What is the difference? When to use one and when to use the other?</p>