title: How to disable the "Optional used as field or parameter type" warning in IntelliJ?
body: <p>Jetbrains has recently decided that <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html">java.util.Optional</a> (as well as Guava's <a href="http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Optional.html">com.google.common.base.Optional</a>) shouldn't be used as field or parameter type... thanks, but no thanks... How can this warning be disabled?</p>
  
  <p>As a side note: triggering warnings on this specific usage of Optional seems completely unjustified...</p>