title: How to modify ggplot2 legend_text?
body: <p>I use </p>
  
  <pre><code>geom_point(aes(colour = factor(ClusterID))) 
  </code></pre>
  
  <p>but I want to get <code>ClusterID</code> visible without the word <code>factor</code>.</p>
  
  <p><strong>How can I modify the legend title in ggplot2?</strong></p>
  
  <p><a href="https://i.stack.imgur.com/XswaM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XswaM.png" alt="enter image description here"></a></p>