title: remove / ignore maven project in intellij
body: <p>I have many modules in intellij (checked out from SCM) and intellij is slow on many actions (indexing,make etc'...)
  I got a suggestion to ignore the maven project by  right click pom.xml and then clicking that:  </p>
  
  <p><a href="https://i.stack.imgur.com/V2n4w.png" rel="noreferrer"><img src="https://i.stack.imgur.com/V2n4w.png" alt="how to ignore project in intellij idea"></a>.  </p>
  
  <p>What is it going to do? what is the difference between ignore and remove?<br>
  Since I have many modules I want to do it from command line. Are these settings stored in files?</p>