title: Index only displays 3 first fields, how to add more fields to the index?
body: <p>I'm trying to add more fields to this index:</p>
  <p><a href="https://i.stack.imgur.com/3THhJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3THhJ.png" alt="enter image description here" /></a></p>
  <p>As you can see, in the image it only gives me the option of: ID, Processed_Date and Date.</p>
  <p>But I want to select: Date, From, Subject, To_Recipients and body.</p>
  <p>How can I add those fields to the dropdow in index creation?</p>