title: Query mongo data if contains a value in an array
body: <p>let's say I have a document with this data structure:</p>
  <pre><code>type Book struct {
      Title          string   `bson:&quot;title, omitempty&quot;`
      Tags           []string `bson:&quot;tags, omitempty&quot;`
  }
  </code></pre>
  <p>How should my code looks like if I want to find a book with tags &quot;science fiction&quot; and &quot;horror&quot; (the resulting books can contains more tags than these two)?</p>
  <p>Thank you.</p>