title: nutch replace parsed content before indexing
body: <p>I am using nutch 1.15. I want to replace some string of the parsed content before getting indexed. </p>
  
  <p>Is there a way to write the regexp and replace the contents?</p>
  
  <p>Example: </p>
  
  <pre><code>Content : "This is the crawled page"
  
  I want to replace "page" with string "content"
  </code></pre>