title: How to return the corresponding line that matches our search keyword in whoosh?
body: <p>Lets say given file <code>a.txt</code>:</p>
  <pre><code>hello world
  good morning world
  good night world
  </code></pre>
  <p>Given the keyword that I want to search is <code>morning</code>, I want to use whoosh python library to return the line that matches the keyword <code>morning</code> in the text file <code>a.txt</code>. So, it will return <code>good morning world</code>. How can I achieve this?</p>
  <p>Update: Here is my schema:</p>
  <pre><code>schema = Schema(title=TEXT(stored=True),
                path=ID(stored=True),
                content=TEXT(stored=True))
  </code></pre>
  <p>then I add a writer add_document to content field</p>